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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Marcha de absorção e balanço de nutrientes no sistema soloplanta para o meloeiro fertirrigado. / Soil absorption and nutrient balance in the soil-plant system for the fertirrigated melon.

OLIVEIRA, Saul Ramos de. 21 May 2018 (has links)
Submitted by Deyse Queiroz (deysequeirozz@hotmail.com) on 2018-05-21T14:55:14Z No. of bitstreams: 1 SAUL RAMOS DE OLIVEIRA - DISSERTAÇÃO PPGHT - 2017.pdf: 1048451 bytes, checksum: b2812626d0423632bee874177b20ee40 (MD5) / Made available in DSpace on 2018-05-21T14:55:14Z (GMT). No. of bitstreams: 1 SAUL RAMOS DE OLIVEIRA - DISSERTAÇÃO PPGHT - 2017.pdf: 1048451 bytes, checksum: b2812626d0423632bee874177b20ee40 (MD5) Previous issue date: 2017 / Um dos fatores que mais contribuem para o encarecimento da produção do meloeiro é o custo com fertilizantes. Assim, para a otimização das doses a serem aplicadas visando a máxima produtividade econômica, faz-se necessário conhecer as demandas nutricionais da cultura, bem como as quantidades exigidas dos nutrientes em fases fenológicas chaves. No presente trabalho objetivou-se determinar a marcha de acumulação de macro e de micronutrientes e o balanço nutricional do meloeiro cultivado sob fertirrigação. O experimento foi realizado em área pertencente à Empresa Ecofértil Agropecuária LTDA localizada no município de Aracati (CE). O experimento foi instalado em delineamento de blocos casualizados com 9 tratamentos, correspondentes a 9 períodos de avaliação 14, 21, 28, 35, 42, 49, 56, 63, 70 dias após transplantio (DAT) com quatro repetições. A parcela útil para fins de coleta foi constituída de 8 plantas tornando-se as quatro centrais de cada fileira. Em intervalos de sete em sete dias, as plantas foram coletadas e separadas em folha, caule, fruto e semente para fins da determinação de N, P, K, Ca, Mg, S, Fe, Mn, B, Zn e Cu, para a quantificação dos totais acumulados destes nutrientes. Na ocasião da coleta de planta, uma amostra de solo foi coletada em cada parcela para a determinação dos nutrientes. De acordo com os resultados, o acúmulo de massa seca nas partes reprodutivas foi maior que nas partes vegetativas, sendo os frutos os órgãos de maior acúmulo de massa seca. Já a marcha de acúmulo de nutrientes seguiu a seguinte ordem: K>Ca>N>Mg>P>S>Fe>Cu>B>Zn>Mn. Os valores do balanço nutricional foram negativos para o potássio, nitrogênio e cobre, sendo recomendado ajuste na fertirrigação em relação a esses nutrientes. / One of the factors that contribute the most to the increase in melon production is the cost of fertilizers. Thus, to optimize the doses to be applied aiming at maximum economic productivity, it is necessary to know the nutritional demands of the crop, as well as the required quantities of the nutrients in key phenological phases. The objective of this study was to determine the progression of macro and micronutrients accumulation and the nutritional balance of the melon cultivated under fertirrigation. The experiment was carried out in an area belonging to the Company Ecofértil Agropecuária Ltda located in the city of Aracati (CE). The experiment was carried out in a randomized block design with 9 treatments, corresponding to 9 evaluation periods 14, 21, 28, 35, 42, 49, 56, 63, 70 days after transplanting (DAT) with four replications. The useful part for the purpose of collection was constituted of 8 plants becoming the four centers of each row. At intervals of seven days, the plants were collected and separated into leaf, stem, fruit and seed for the determination of N, P, K, Ca, Mg, S, Fe, Mn, B, Zn and Cu, for The quantification of accumulated totals of these nutrients. At the time of plant collection, a soil sample was collected in each plot to determine the nutrients. According to the results, the accumulation of dry mass in the reproductive parts was higher than in the vegetative parts, the fruits being the organs with the highest accumulation of dry mass. However, the nutrient accumulation progressed in the following order: K> Ca> N> Mg> P> S> Fe> Cu> B> Zn> Mn. The values of the nutritional balance were negative for potassium, nitrogen and copper, being recommended adjustment in fertirrigation in relation to these nutrients.

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