Orientador: Morel de Passos e Carvalho / Banca: Marcelo Andreotti / Banca: Célia Regina Lopes Zimback / Resumo: O arroz é uma das fontes básicas de alimentação da humanidade. No processo de modernização e racionalização da agricultura brasileira, o uso de adubação adequada constitui um fator importante para o aumento da produtividade das culturas, redução dos custos de produção, maior retorno econômico para os produtores e redução do risco de degradação do meio ambiente. Assim, durante o ano agrícola 2009/2010, no município de Selvíria (MS), no Cerrado Brasileiro, foram estudados os atributos do arroz de terras e os atributos químicos de um LATOSSOLO VERMELHO Distroférrico sob sistema plantio direto, irrigado por pivô central. O objetivo foi selecionar entre os atributos pesquisados, aquele com a melhor correlação, linear e espacial, para explicar a variabilidade da produtividade do arroz de terras altas. Foi instalada a malha geoestatística, para a coleta de dados do solo e da planta, com 120 pontos amostrais, numa área de 3,0 ha e declive homogêneo de 0,055 m m-1. Do ponto de vista linear, o número de espiguetas viáveis por panícula apresentou correlação potencial direta com a produtividade de grãos de arroz. Entretanto, do ponto de vista espacial, o teor da matéria orgânica do solo, quando avaliada na camada 0,10 - 0,20 m, apresentou-se como indicador da produtividade de grãos de arroz. Dessa forma, visando-se auxiliar futuros trabalhos voltados à agricultura de precisão, os quais venham a utilizar os mesmos atributos que os do presente, os valores dos alcances da dependência espacial a serem empregados deverão estar compreendidos entre 40,2 e 181,2 metros / Abstract: The rice is one of the basic sources of the humanity's feeding. In the modernization process and rationalization of the Brazilian agriculture, the use of appropriate fertilization constitutes an important factor for the increase of the yield crop, reduction of the production costs, larger economical return for the producers and reduction of the risk of degradation of the environment. Like this, during the agricultural year 2009/2010, in Selvíria County, Mato Grosso do Sul State, in the Brazilian Savannah, they were studied the attributes of the rice uplands and the chemical attributes in a Dystropherric Red Latosol (Typic Acrustox) under no-tillage, irrigated by central pivot. The objective was to select among the researched attributes, that with the best correlation, spatial and linear, to explain upland rice yield variability. The geostatistical grid was installed, to collect the soil and plant data, with 120 sampling points, in an area of 3.0 ha and and homogeneous slope of 0.055 m m-1. Of the linear point of view, the number of viable spikelets per panicle showed direct potential correlation with the yield of grains of rice. However, of the spatial point of view, the organic matter soil, when appraised in the layer 0.10-0.20 m, showed up came as indicator of the yield of grains of rice. Thus, in order to support future researches concern precision agriculture, which uses the same attributes of this research, the values of the range of the spatial dependence to be utilized should be among 40.2 and 181.2 meters / Mestre

1933年(昭和8年)日本因全球經濟大蕭條引發「昭和農業恐慌」，加上帝國內部米穀供應嚴重過剩，米價大幅滑落，促使日本政府加強米榖方面的各項統制措施。本文試圖由1933年開始至1945年日本戰敗為止，日本政府為因應米穀供應過剩或者不足所採取的各項統制措施，及其對殖民地臺灣所產生的影響。日本政府實施之米穀統制政策，對臺灣米穀生產造成影響者，如1933年實施的「米穀統制法」、1936年的「米穀自治管理法」、1939年於臺灣內部實施的「臺灣米穀移出管理令」、1942年7月1日施行的「食糧管理法臺灣施行令」、1943年底的「臺灣食糧管理令」、還有1944年年中推行的「米穀增產及供出獎勵相關特別措施」等。由這些米穀統制法令及措施，可以了解日本的臺灣總督府用盡一切方法，就是為了使其最重要的民生主食「稻米」的生產及供應，能達到「自給自足」的目標。臺灣，作為日本殖民帝國下的一員，為配合帝國整體米穀供需穩定，對於「看天吃飯」的米穀生產，悲願地追求其自足目標。臺灣蓬萊米生產的擴大與臺日米價間的互動，連帶影響臺灣糖價及其他農作物的生產，並可藉此了解日本與臺灣之間，因稻米生產而衍生出的統制生產架構。 / In 1933, the world economic recession (the Great Depression) caused the imperial Japan into the so called 「Showa Agricultural Panic」 and made the imperial internal rice supply overwhelmingly surplus. Those　made the price of rice in Japan at that time fallen considerably, prompting the Japanese government to strengthen the rice control policies.This article, from 1933 to 1945, tries to explain the impacts of the Japanese government's various rice control policies which responded to the rice oversupply or insufficient upon the colonial Taiwan. The rice control policies Japanese government implemented made great influence upon Taiwan's rice production, such as in 1933, the enactment of the "Rice Control Law" ; in 1936, the enactment of the " Rice Self-management Law " ; in 1939, only in Taiwan enacted, the" Taiwan Rice Shipment Administration Order " ; in July 1 1942," The Staple Food Control Act's Taiwan Enforcement Order ” ; the end of 1943, “ Taiwan's Staple Food Control Administration Order ”; and promulgated in mid-1944 “Special Measures on Enhancing Rice Production and Awarding Shipment ",etc.Through those rice control laws and measures, we can understand the Japanese rulers exhausted to make people's livelihood, the production and supply of the most important staple food "rice", could achieve the goal of “self-sufficiency ".Taiwan, as one part of the Japanese colonial Empire, had to cooperate with the whole Empire’s rice supply and demand as stable as possible. Regarding the rice production which depends on the weather, Taiwan like Japan vows to pursue the goal of “self-sufficiency” with the earnest wish. The expansion of production of the Taiwan Formosan rice (Penglai rice) and the interaction of rice prices between the Taiwan and Japan influenced the Taiwan's sugar price and the production of other crops. Therefore, we can understand the control production structure caused by the rice production between Japan and Taiwan.

Das übergeordnete Ziel dieser Studie ist es, die Auswirkungen des Eindringens von Salzwasser auf den Reisanbau bei unterschiedlichen Salzgehalten zu analysieren und zu untersuchen, wie Veränderungen in den Reissortenoptionen innerhalb der nördlichen zentralen Küstenregion Vietnams dazu beitragen können, diese Auswirkungen zu reduzieren. Auf Böden mit hohem Salzgehalt, die für den Reisanbau nicht mehr geeignet sind, werden geeignetere Anpassungsstrategien gefordert, indem die Präferenz der Landwirte für verschiedene Anbaufolgen und die Faktoren, die ihre Präferenzen im Zusammenspiel mit verschiedenen Salzgehaltsstufen beeinflussen, untersucht werden. Die Studie untersuchte die Auswirkungen des Salzgehalts auf den Mittelwert und die Variabilität der Reiserträge in vier Gemeinden der Provinz und untersuchte mögliche Änderungen im Portfolio der Reissorten, die Erträge zu steigern und gleichzeitig die Ertragsvariabilität zu verringern. Außerdem wurden die Auswirkungen des Salzwassereinbruchs auf die Produktivität und die technische Effizienz der Reisfarmen im Untersuchungsgebiet bewertet. Im Gegensatz zu bestehenden Studien wurden in dieser Untersuchung die Auswirkungen der Bodenversalzung analysiert. Salztolerante Reissorten können die Erträge sichern, solange der Salzgehalt moderat ist, sind aber ungeeignet, sobald der Salzgehalt hoch ist. Dies führte zur Durchführung eines dritten methodischen Ansatzes, der mit Hilfe eines Choice-Experiments Informationen über die Präferenzen und Motivationen der Reisbauern für die Wahl zwischen dem Portfolio der lokal möglichen adaptiven und transformativen Optionen generierte. Die Adoptionsergebnisse der Befragten bei verschiedenen Versalzungsgraden wurden ebenfalls simuliert. Die Ergebnisse zeigen, dass sich der Salzgehalt negativ auf die Reiserträge auswirkt, zu einer Erhöhung der Variabilität der Erträge beiträgt und die technische Effizienz von Reis in Abhängigkeit von den Reissorten verringert. / The overall objective of this study is to analyze the impact of saltwater intrusion on rice cultivation at different salinity levels and it also explores how changes in the rice cultivar options within the north central coastal region of Vietnam can help to reduce these impacts. In soils with high salinity levels which are no longer suitable for rice cultivation, more suitable adaptation strategies are called upon through examining farmers’ preference for different crop sequences and the factors affecting their preferences in the interaction with various levels of salinity. The study investigated impacts of salinity on mean and variability of rice yields in four communes of Thua Thien Hue Province and looked at possible changes in the portfolio of rice cultivars, which would offer farmers the potential to increase yields and decrease yield variability simultaneously. I also evaluated the impact of saltwater intrusion on the productivity and technical efficiency of rice farms in the study area. Contrasting to existing studies, this research analyzed season-differentiated impact of soil salinity. Salt tolerant rice varieties can secure yields as long as salinity levels are moderate but are inappropriate once salinity becomes severe. This led to the conduct of third methodological approach that generated information about rice farmers’ preferences and motivations for choosing among the portfolio of locally feasible adaptive and transformative options using a choice experiment. The respondents’ adoption outcomes at different salinity levels were also simulated. The results showed that salinity has negative impact on rice yields, contributes to an increase in variability of yields and reduces rice technical efficiency depending on rice varieties.