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Choi, Yuk Kam. / Thesis submitted in: December 2008. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (leaves 204-221). / Abstracts in English and Chinese. / Abstract --- p.i / Abstact (in Chinese) --- p.iv / Acknowlegement --- p.vi / Table of contents --- p.viii / List of tables --- p.xiii / List of figures --- p.xv / List of plates --- p.xvi / Chapter CHAPTER 1 --- INTRODUCTION --- p.1 / Chapter 1.1 --- Research background --- p.1 / Chapter 1.2 --- Conceptual framework --- p.3 / Chapter 1.3 --- Research objectives --- p.10 / Chapter 1.4 --- Significance of the study --- p.10 / Chapter 1.5 --- Organization of this thesis --- p.11 / Chapter CHAPTER 2 --- LITERATURE REVIEW --- p.13 / Chapter 2.1 --- Introduction --- p.13 / Chapter 2.2 --- Hong Kong's forestry and use of native species in ecological restoration --- p.14 / Chapter 2.3 --- Factors limiting the use of native species in ecological rehabilitation --- p.17 / Chapter 2.4 --- The climate and soils in Hong Kong --- p.19 / Chapter 2.5 --- Soil physical properties --- p.22 / Chapter 2.5.1 --- Soil water and water holding capacity --- p.23 / Chapter 2.5.2 --- Penetration resistance --- p.26 / Chapter 2.5.3 --- Soil structure --- p.27 / Chapter 2.6 --- Soil amendment materials --- p.29 / Chapter 2.6.1 --- Compost --- p.30 / Chapter 2.6.2 --- Coconut meal --- p.32 / Chapter 2.6.3 --- Water absorbing polymer --- p.35 / Chapter 2.7 --- Summary --- p.39 / Chapter CHAPTER 3 --- EFFECT OF AMENDMENT MATERIALS ON PHYSICAL PROPERTIES OF DECOMPOSED GRANITE AND THE GROWTH OF SCHIMA SUPERBA : GREENHOUSE EXPERIMENT I --- p.41 / Chapter 3.1 --- Introduction --- p.41 / Chapter 3.2 --- Materials and methods --- p.42 / Chapter 3.3 --- Experimental design --- p.43 / Chapter 3.3.1 --- "Amending DG with water absorbing polymer, coconut meal and compost" --- p.43 / Chapter 3.3.2 --- Watering treatment --- p.45 / Chapter 3.3.3 --- Post-planting treatment --- p.47 / Chapter 3.3.4 --- Monitoring of penetration resistance and soil moisture content --- p.48 / Chapter 3.4 --- Plant growth measurement --- p.49 / Chapter 3.4.1 --- Survival rate --- p.49 / Chapter 3.4.2 --- Height and basal diameter --- p.49 / Chapter 3.4.3 --- Chlorophyll fluorescence --- p.49 / Chapter 3.4.4 --- Aboveground biomass --- p.50 / Chapter 3.5 --- Laboratory analysis --- p.50 / Chapter 3.5.1 --- Texture --- p.50 / Chapter 3.5.2 --- Reaction pH and conductivity --- p.51 / Chapter 3.5.3 --- Organic carbon of soil and the amended substrates --- p.51 / Chapter 3.5.4 --- Total carbon of coconut meal and compost --- p.51 / Chapter 3.5.5 --- Total Kjeldahl Nitrogen --- p.52 / Chapter 3.5.6 --- Total phosphorus --- p.52 / Chapter 3.5.7 --- Exchangeable A1 and H and total exchangeable acidity --- p.53 / Chapter 3.5.8 --- "Total potassium, sodium，calcium and magnesium" --- p.53 / Chapter 3.5.9 --- Heavy metals --- p.53 / Chapter 3.5.10 --- Exchangeable cations --- p.53 / Chapter 3.5.11 --- Water absorbency of water absorbing polymer --- p.54 / Chapter 3.5.12 --- Water retention capacity --- p.54 / Chapter 3.5.13 --- Mean weight diameter --- p.54 / Chapter 3.6 --- Statistical analysis --- p.55 / Chapter 3.7 --- Results and discussion --- p.55 / Chapter 3.7.1 --- Properties of decomposed granite --- p.55 / Chapter 3.7.2 --- "Properties of water absorbing polymer, coconut meal and compost" --- p.58 / Chapter 3.8 --- Effects of amendment materials on DG --- p.60 / Chapter 3.8.1 --- Penetration resistance --- p.60 / Chapter 3.8.2 --- Soil moisture --- p.64 / Chapter 3.8.3 --- Water release characteristic curves and available water content --- p.69 / Chapter 3.8.4 --- Effect of amendment materials on soil organic carbon --- p.74 / Chapter 3.8.5 --- Relationship between SOC and water release characteristics --- p.77 / Chapter 3.8.6 --- Mean weight diameter --- p.78 / Chapter 3.9 --- Effects of amendment materials on the growth of Schima superba --- p.81 / Chapter 3.9.1 --- Survival rate --- p.81 / Chapter 3.9.2 --- Height and basal diameter increment --- p.84 / Chapter 3.9.3 --- Aboveground biomass --- p.88 / Chapter 3.9.4 --- Chlorophyll florescence --- p.89 / Chapter 3.10 --- Summary --- p.91 / Chapter CHAPTER 4 --- EFFECT OF AMENDMENT MATERIALS ON PHYSICAL PROPERTIES OF DECOMPOSED GRANITE AND THE GROWTH OF CASTANOPSIS FISSA: GREENHOUSE EXPERIMENT II --- p.94 / Chapter 4.1 --- Introduction --- p.94 / Chapter 4.2 --- Materials and methods --- p.95 / Chapter 4.2.1 --- Materials --- p.95 / Chapter 4.2.2 --- Experimental design --- p.96 / Chapter 4.2.3 --- Preparation of growth substrates --- p.96 / Chapter 4.2.5 --- Soil sampling --- p.98 / Chapter 4.2.6 --- Monitoring of soil moisture change and penetration resistance --- p.99 / Chapter 4.2.7 --- Plant growth measurement --- p.100 / Chapter 4.2.8 --- Laboratory analysis --- p.101 / Chapter 4.3 --- Results and discussion --- p.101 / Chapter 4.3.1. --- Properties of DG --- p.101 / Chapter 4.3.2 --- Water absorbency of ALCOSORB® --- p.103 / Chapter 4.3.3 --- Effect of amendment materials on physical properties of DG --- p.103 / Chapter 4.3.4 --- Effect of soil amendment on water release characteristic curves --- p.109 / Chapter 4.3.5 --- Soil evaporation test --- p.113 / Chapter 4.3.6 --- Soil organic carbon --- p.119 / Chapter 4.3.7 --- Mean weight diameter --- p.121 / Chapter 4.3.8 --- Effects of amendment materials on the growth of Castanopsis fissa --- p.123 / Chapter 4.3.8.1 --- Survival rate --- p.123 / Chapter 4.3.8.2 --- Height and basal diameter --- p.126 / Chapter 4.3.8.3 --- Aboveground biomass --- p.132 / Chapter 4.3.8.4 --- Chlorophyll fluorescence --- p.134 / Chapter 4.4 --- Summary --- p.136 / Chapter CHAPTER 5 --- CAN WATER ABSORBING POLYMER BENEFIT QUARRY REHABILITATION IN THE DRY SEASON? --- p.139 / Chapter 5.1 --- Introduction --- p.139 / Chapter 5.2 --- The study area --- p.142 / Chapter 5.2.1 --- The Anderson Road Quarry --- p.142 / Chapter 5.2.2 --- Rehabilitation of Anderson Road Quarry --- p.143 / Chapter 5.3 --- Experimental design --- p.145 / Chapter 5.3.1 --- Site preparation --- p.145 / Chapter 5.3.2 --- Selection of native species for planting --- p.147 / Chapter 5.3.3 --- The planting --- p.148 / Chapter 5.3.4 --- Data logging the growth environment --- p.150 / Chapter 5.3.5 --- Plant growth measurement --- p.150 / Chapter 5.3.6 --- Soil sampling and analysis --- p.151 / Chapter 5.4 --- Statistical analysis --- p.151 / Chapter 5.5 --- Results and discussion --- p.152 / Chapter 5.5.1 --- Properties of decomposed granite in ARQ --- p.152 / Chapter 5.5.2 --- Survival rate --- p.155 / Chapter 5.5.3 --- Height and basal diameter increments --- p.157 / Chapter 5.5.4 --- Major limiting factors for the establishment of seedlings --- p.160 / Chapter 5.5.4.1 --- Drought --- p.160 / Chapter 5.5.4.2 --- Soil erosion caused by rainstorm --- p.163 / Chapter 5.6 --- Summary --- p.165 / Chapter CHAPTER 6 --- EFFECT OF WATER ABSORBING POLYMER ON THE GROWTH OF NATIVE SPECIES IN A RESTORED QUARRY --- p.167 / Chapter 6.1 --- Introduction --- p.167 / Chapter 6.2 --- Study area --- p.168 / Chapter 6.3.2 --- Data logging the growth environment --- p.169 / Chapter 6.3.3 --- Plant growth measurement --- p.169 / Chapter 6.3.4 --- Spatial variation of irrigation water --- p.170 / Chapter 6.4 --- Statistical analysis --- p.170 / Chapter 6.5 --- Results and discussion --- p.170 / Chapter 6.5.1 --- Survival rate --- p.170 / Chapter 6.5.2 --- Height and basal diameter increments --- p.178 / Chapter 6.5.3 --- Growth environment in Anderson Road Quarry --- p.185 / Chapter 6.5.4 --- Weed competition --- p.189 / Chapter 6.6 --- Summary --- p.190 / Chapter CHAPTER 7 --- CONCLUSIONS --- p.191 / Chapter 7.1 --- Summary of major findings --- p.191 / Chapter 7.2 --- Implications of the study --- p.196 / Chapter 7.3 --- Limitations of the study --- p.199 / Chapter 7.4 --- Suggestions for further study --- p.200 / REFERENCES --- p.204 / APPENDICES --- p.222

The endogenous cytokinin levels in the brown alga Ecklonia maxima (OSBECK) PAPENF., and the effect of applications of the seaweed concentrate (Kelpak 66) prepared from this alga, on the growth and yield of various plants was investigated. Tentative identification of the cytokinins present in Ecklonia maxima using High Performance Liquid Chromatography revealed the presence of cis and trans-ribosylzeatin, trans-zeatin, dihydrozeatin and isopentenyladenosine. Seasonal and lunar variations in the endogenous cytokinin levels in fresh and processed Ecklonia maxima material were investigated. Lamina, stipe and holdfast regions of one, two and three metre plants harvested from February 1981 until January 1982 together with samples of processed material from the normal production run, collected over the same period were used in this investigation. Analysis revealed both qualitative and quantitative changes in the cytokinin levels which were closely correlated to the seasonal patterns of growth of Ecklonia maxima. During summer zeatin, ribosylzeatin and their dihydroderivatives were responsible for most of the detected activity. The cytokinin glucosides increased above the levels of free cytokinins during winter. The lunar cycle study of material harvested on a daily basis during April - May 1983 revealed marked fluctuations in the cytokinin levels in the various tissues of two metre plants which were closely correlated with the phases of the moon. Greenhouse trials were conducted to determine the effects of the commercially available seaweed concentrate (Kelpak 66) on the growth of Lycopersicon esculentum MILL. plants in nematode infested soil. Kelpak 66 at a dilution of 1 : 500 improved the growth of treated plants significantly, irrespective of whether it was applied as a foliar spray at regular intervals, or whether the soil in which the plants were grown was flushed once with the diluted seaweed concentrate. Root growth was significantly improved whenever the seaweed concentrate was applied. Associated with this improved root growth was a reduction in the infestation of Meloidogyne incognita (KOIFORD and WHITE) CHITWOOD. Finally, the effect of seaweed concentrate and fertilizer applications on the growth and endogenous cytokinin content of Beta vulgaris L. and Phaseolus vulgaris L. plants was investigated. Seaweed concentrate at a dilution of 1 : 500 applied as a foliar spray improved the growth of treated plants significantly, irrespective of whether it was applied on its own or together with a chemical fertilizer. Root growth and the endogenous cytokinin content of these roots increased with seaweed concentrate application. Increases were also detected in the cytokinin content of fruits of Phaseolus vulgaris plants treated with seaweed concentrate. Associated with this increase in the cytokinin content was an increase in the dry mass of the fruit from treated plants. The significance of these findings and the possible relationship between the endogenous cytokinins present in Ecklonia maxima and the effect of the seaweed concentrate on plant growth is discussed. / Thesis (Ph.D.)-University of Natal, Pietermaritzburg, 1984.

Orientador: Everlon Cid Rigobelo / Banca: Diego Cunha Zied / Banca: Davi Rodrigo Rossatto / Banca: José Eduardo Marcondes de Almeida / Banca: Felipe Batistella Filho / Resumo: A representatividade da agricultura brasileira é reconhecida mundialmente, especialmente na produção de grãos como a soja, o milho e o feijão. A produtividade nas lavouras, especialmente na última década, tem apresentado crescimento expressivo, entretanto, um dos aspectos negativos associados a esse processo é o aumento concomitante no uso de defensivos e fertilizantes. Atualmente, o tema se tornou uma preocupação de saúde pública e ambiental dada a toxicidade e recalcitrância desses compostos. Dentre formas alternativas ao uso desses insumos o estudo de micro-organismos é promissor, pois eles constituem um grande patrimônio genético que alberga vias metabólicas de grande interesse para diversas atividades humanas, incluindo a agricultura. Os micro-organismos interagem de diversas maneiras com as plantas beneficiando-as e garantindo recursos para si em troca. Eles podem atuar melhorando o aporte de nutrientes, os mecanismos de defesa e de promoção de crescimento em condições de estresse biótico e abiótico. Assim, o presente estudo teve como objetivos o isolamento de fungos a partir de amostras de solo, com enfoque para fungos do gênero Purpureocillium; sua caracterização molecular e de seu potencial de promoção de crescimento de plantas in vitro; e a seleção de linhagens para serem testadas in planta em soja, milho e feijão. O isolamento foi realizado utilizando meios convencionais e seletivos para a obtenção dos fungos. Os isolados tiveram seu DNA extraído e as regiões ITS (... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The representativeness of Brazilian agriculture is worldwide recognized, especially in the grains production such as soybean, maize and beans. Crops' yield, especially in the last decade, has presented significant growth, however, one of the negative aspects associated with this process is the concomitant increase in the use of pesticides and fertilizers. Currently, this issue has become a public health and environmental concern because of the toxicity and recalcitrance of these compounds. Among alternatives to the use of these inputs the study of microorganisms is promising because they constitute a great genetic patrimony, which houses metabolic pathways of great interest for several human activities, including agriculture. Microorganisms are able to interact in different ways with plants benefiting them and ensuring resources for themselves in return. They can act by improving nutrient supply, defense mechanisms and promoting growth under conditions of biotic and abiotic stress. Thus, the present study aimed the isolation of fungi from soil samples, focusing on the search for fungi of the genus Purpureocillium; their molecular characterization and the assessment of their in vitro plant growth promotion potential; and the selection of strains to be tested in planta in soybean, maize and bean. Fungal isolation was performed using conventional and selective media. The isolates had their DNA extracted and the ITS (Internal Transcribed Spacer) region of the ribosomal DNA and pa... (Complete abstract click electronic access below) / Doutor

A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg in fulfilment of the requirements for the degree of Master of Science. Johannesburg 1995 / This project represents the development of a comprehensive description of the growth of two plant species (namely white clover and Italian ryegrass) in a mixed canopy: Particular attention has been paid to the impact of two symbiotic associations (legume root nodules and vesicular arbuscular mycorrhizae) on the growth of the two plant species. [Abbreviated Abstract. Open document to view full version] / MT2017

Thesis (MTech (Horticulture)--Cape Peninsula University of Technology, 2017. / A study was conducted to investigate the effects of various media composition and wounding treating on the in vitro propagation of Argyroderma subalbum and A. testiculare explants derived from mature plants, antioxidants and plant growth regulators (PGR) concentrations. One experiment consisted of 3 medium types including Murashige and Skoog (MS) medium strength, vitamin supplement. Fifteen replicates were used for each treatment. The shoots were then sub-cultured to ten replicate regenerated medium consisting of varying levels and combination of indole-3-acetic acid (IAA) and 10 μM 6-Benzyladenine (BA) supplements. In another experiment consisted of varying levels of auxins with MS medium strength, activated charcoal (AC) and vitamin supplements ten replicates were used for each treatment. Results indicated the positive role of cytokinins types’ 6-Benzyladenine (BA), 2-isopentyladenine (2iP) and Kinetin in inducing callus formation from wounded explants. The highest rate of friable callus formation of wounded explants was observed in media containing vitamin supplementation with BA at 10 μM. Callus formation significantly increased with the addition of vitamins at 10 μM on BA, 2iP and kinetin. With regards to the effects of various media composition and wounding explants on in vitro growth and regeneration of A. subalbum and A. testiculare, significant results were achieved with BA, 2iP and kinetin concentrations on explants discoloration and callus formation. The antioxidant treatment, AC did not reduce explants discoloration, but the induction of the callus was developed furthermore, results showed that IAA with BA concentrations without addition of AC there was significantly difference on both species but A. subalbum dominated with browning intensity (Chapter 3). Only sub-culturing of the explants succeeded in preventing explants discoloration and subsequently increased the number of shoots. The interaction between Indole-3-acetic acid (IAA) concentrations combined with BA resulted in the most effective technique in reducing explants discoloration at the media contact point. This study provides an insight into the contributing factor and methods of overcoming the major problem of phenolic oxidation and promoting the in vitro growth and regeneration of A. subalbum and A. testiculare.

Thesis (MTech (Horticulture))--Cape Peninsula University of Technology, 2017. / The exact responses to the concentration of compost tea extract and methods of irrigation application were not previously measured on Hypoxis hemerocallidea and Siphonochilus aethiopicus. Commercial exploitation, habitat loss and degradation, overharvesting, and enhancement of their medicinal properties, have led to this investigation and the need to replenish both these valuable plant species. This is crucial for plant survival, especially in the wild and for use of the traditional medicinal plants. Hypoxis hemerocallidea and Siphonochilus aethiopicus, known as star flower and wild ginger respectively continue to decline, due to overharvesting from their natural habitat. Both these species have tremendous traditional medicinal value among localized African people. To enhance their commercial cultivation, compost tea extracts, in the following ratios (no catalyst added (control1); T 1000:1, T750:1, T500:1, and T250:1L) were applied in equal dosages to determine an optimal compost tea extract ratio. The experiment was conducted in a temperature controlled greenhouse. Mushroom compost (500 g, per brew) was used for all extracts. Brewing was done with no catalyst added (Control 1), and 24 hours later another brew was done with catalyst added, weekly for 20 weeks. The Control treatment received water only. Both species were slow growing and comparatively, the Hypoxis plants responded faster than the Siphonochilus plants. In this investigation, plant growth parameters such as plant height, number of leaves, leaf width, leaf length and leaf colour, were measured and evaluated. Despite the plants positive response to the mushroom compost tea extracts, across all the above plant growth parameters, no significant differences were noted between the treatments during the twenty-week application period. Leaf chlorophyll content peaked in week 11 of the hypoxis plants and was the highest in week 14 of the Siphonochilus plants with no significant interaction between weeks vs. treatment over the twenty-week experiment. The chlorophyll readings indicate that both species increased their chlorophyll production over time. Although the total wet leaf length, root length, corm diameter, leaf weight, corm weight and root weight of Hypoxis were non-significant between treatments, T500:1 total wet weight was significantly higher when compared to the rest of the treatments. The total dry weight analysis of hypoxis was non-significant. Control Calcium level was significantly lower between the control and the treatments of the Hypoxis total dry leaf nutrient analysis. The Hypoxis dried roots nutrient analysis was non-significant across treatments.

Orientador: Alaxandre Magno Sebbenn / Banca: Mario Luiz Teixeira de Moraes / Banca: Rinaldo Cesar de Paula / Resumo: Os métodos baseados em marcadores genéticos para estimar o coeficiente de herdabilidade em populações naturais são importantes, visto que os métodos tradicionais baseados em teste de progênies são impraticáveis para este fim por introduzirem vícios devido às interações genótipo-ambientes, variações no sistema de reprodução e efeitos amostrais. O objetivo deste trabalho foi investigar o controle genético de caracteres de crescimento em populações contínuas e fragmentadas de Araucaria angustifolia. As seguintes questões que foram abordadas são: i) Existem diferenças nos níveis de herdabilidade entre diferentes populações e entre gerações de mesma população? e ii) Quais os níveis de herdabilidade em caracteres de crescimento em populações naturais? O presente estudo foi desenvolvido com duas populações de A. angustifolia, sendo uma delas localizada na Reserva Genética Florestal de Caçador (RGFC), no Planalto Norte do Estado de Santa Catarina, e a outra em um fragmento de floresta de 5,4 ha (população CENI) localizada em uma fazenda no planalto do Estado do Paraná, dentro das bacias do Iguaçu. As estimativas de herdabilidades foram realizadas utilizando-se dados de genótipos de indivíduos regenerantes e juvenis do fragmento CENI e juvenis da população RGFC. Foram utilizados quatro métodos para estimar o parentesco entre os indivíduos e três modelos de estimação do coeficiente de herdabilidade, implementados no programa Mark. As herdabilidades estimadas pela combinação de todos os métodos de estimação de parentesco e modelos de herdabilidade não foram significativamente diferentes de zero, indicando inadequação dos dados aos modelos ou ausência de controle genético. Um novo método para estimar a herdabildiade em populações naturais, baseado na reconstrução do pedigree, derivado de resultados de análise de maternidade e paternidade foi então ... / Abstract: Marker-based methods for estimating the coefficient of heritability in natural populations are important because traditional methods may be impractical or introduce bias via interaction genotype-environmental effects, mating system variation and sampling effects. Thus, the aim of this study is to investigate the genetic control of growth traits in Araucaria angustifolia population continuous and fragmented. The following questions will be addressed: i) There are differences in the levels of heritability between different populations and between generations of the same population? and ii) What levels of heritability for growth traits in natural populations? This study was carried out using two populations of A. angustifolia, one being located in the Reserve Forest Genetics Caçador (RGFC), on the plateau north of the state of Santa Catarina, and other is in a small forest fragment of 5, 4 ha (CENI) located on a farm in the highlands of the state of Paraná, in the basins of Iguaçu. The estimates of heritability were carried out using data of genotypes of regeneration and juveniles of CENI population and juvenile of RGFC population. We used four methods to estimate the relatedness between pairwise individuals and three models for estimating the heritability coefficient, all implemented in the Mark program. The heritability estimates for the combination of all methods of estimation of relatedness and heritability models were not significant different from zero, indicating the inadequacy of the data to the models. There is a tendency for a higher genetic control in the regeneration than juvenile stage. The CENI fragmented population had generally higher heritability than the RGFC natural population, indicating higher potential to respond to natural selection. The main conclusion of this study is ... / Mestre

Orientador: Iraê Amaral Guerrini / Banca: Dirceu Maximino Fernandes / Banca: Clarice Backes / Banca: Rodrigo de Menezes Trigueiro / Banca: Daniela Soares Alves Caldeira / Resumo: A teca está entre as espécies florestais mais plantadas nos países tropicais por apresentar uma das madeiras mais valiosas e apreciadas no mundo. Entretanto, pouco se sabe sobre as necessidades nutricionais da teca, sendo o manejo da adubação um dos fatores limitantes para seu cultivo. O objetivo deste trabalho foi avaliar o desenvolvimento da Tectona grandis L.f. em relação à interação dos fatores nutricionais de P e K em condições de campo. O experimento foi conduzido a campo na Fazenda São Tomaz, de propriedade da Companhia do Vale do Araguaia - Água Boa/MT. Este, sob delineamento em blocos ao acaso, com 11 tratamentos e 4 repetições, em esquema fatorial 3x3 (P = 90, 180 e 360 g de P2O5 planta-1; K = 35, 70 e 140 g de K2O planta-1), mais um tratamento adicional (P = 0 + K = 70 g de K2O planta-1) e testemunha com calcário (elevação de V% = 70%). A espécie é mais exigente ao fósforo em relação ao potássio, quando aplicados no plantio. Para as condições a campo estudadas (adubação base: N= 90 g planta-1 e V%= 70), recomenda-se a adubação de 90 g planta-1 de P2O5 e 70 g planta-1 de K2O na época de plantio. / Abstract: Teak is among the most planted tree species in tropical countries by presenting the most valuable and prized woods in the world. However, little is known about the nutritional needs of teak and handling of manure, limiting the cultivation. The objective of this work the development of Tectona grandis L.f. regarding the interaction of nutritional factors of P and K in field conditions. The experiment was conducted under field conditions in São Thomaz Farm, owned by Companhia Vale do Araguaia - Água Boa/MT. It, under randomized block design with 11 treatments and 4 replications in a factorial 3 x 3 (P = 90, 180 and 360 g plant-1 of P2O5; K = 35, 70 and 140 g plant-1 of K2O), an additional treatment (P = 0 + K = 70 g plant-1 of K2O) and control with limestone (V% = 70%). The species is more demanding when compared to phosphorus to potassium, applied at planting. For the specific field conditions (base fertilization: N = 90 g plant-1 and V = 70%), recommend 90 g plant-1 of P2O5 and 70 g plant-1 of K2O at planting / Doutor