Dissertation abstracts: Study on improving the cropping systems on some main soil types in Dong Hy District Thai Nguyen Province

Research objectives: Researching for improved cropping systems with proposed cropping structure on rice-based land in Dong Hy District, Thai Nguyen Province in the period of 2010 -2020; researching and applying some cultivation techniques for the tea production on hilly land in Dong Hy District, Thai Nguyen Province.
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Dissertation abstracts: Study on improving the cropping systems on some main soil types in Dong Hy District Thai Nguyen Province 1 PART 1 INTRODUCTION1. Background Dong Hy is a mountainous district of Thai Nguyen Province withtotal natural area of 46,177 ha in which there are 26% of agriculturalland, 45% of forest land, 0.37% of aquaculture, 5% of land for specificpurposes; 2% of living land; 22% of unused land. The structure ofagricultural land includes 53% for annual crops, 39% for perennialcrops, and 8% for others. The annual crops include cereal crop group,short-term industrial plant group, group of vegetables and beans. Theperennial crops include tea, litchi, longan, mango, jackfruit plants etc. With the land, crop structure as well as the natural - economicand social conditions of Dong Hy District as mentioned above; togradually change the cropping system forward to market orientedproduction and to develop the sustainable agriculture system definitelyneeds research on improving cropping systems in Dong Hy District.Based on these issues, we conducted a study titled “Study on improvingthe cropping systems on some main soil types in Dong Hy District -Thai Nguyen Province.”2. Research objectives - Researching for improved cropping systems with proposedcropping structure on rice-based land in Dong Hy District, Thai NguyenProvince in the period of 2010 -2020. - Researching and applying some cultivation techniques for thetea production on hilly land in Dong Hy District, Thai NguyenProvince.3. Research requirements - Evaluating the current cropping systems on rice-based and hillyland in Dong Hy District. - Studying to select the suitable varieties of crops in the spring,summer and winter crops on rice-based land. Studying on some suitabletechniques for tea production on hilly land. - Building demonstration plots on rice-based and hilly land basedon research results obtained. - Proposing development plans for new cropping systems inDong Hy District in the future. 24. Research limit The study focuses on analyzing and evaluating the status of cropproduction on some main kinds of agriculture land in Dong Hy District,including cropping systems on one-rice crop land, two-cropland andthree-crop land of rice-based land system; perennial cropping systemson hilly land in Dong Hy District; The study focuses on testing for selection of some new varietieswith high yield - high economic efficiency and building demonstrationplots on rice-based lowland in Dong Hy District, testing for selection ofchemical fertilizer rates combined with microbial fertilizer for tea onhilly land, testing some techniques for moisture maintenance in tea fieldin winter season and building demonstration plots for sustainable teaproduction – high economic efficiency from tea production in Dong HyDistrict.5. New findings of the study - For annual crops on rice-based lowland in Dong Hy District:Improved crop varieties in this area have increased the productivity andeconomic efficiency of the rotation treatment. - Additional winter potato crop on two-rice lowland has increasedthe economic efficiency of crop rotation treatment and improved soilnutrient content. - Additional peanut crop or soybean crop on one-rice lowland hasincreased the productivity and economic efficiency of cropping systemsand soil nutrient properties. - Studying and building the demonstration model of sustainabletea production with some technical methods such as balanced-fertilizercombined, moisture maintenance in winter-spring crops increased notonly productivity - economic efficiency but also soil nutrient properties. PART 2 LITERATURE REVIEW AND SCIENCETIFIC BASIS2.1. Scientific basis of cropping systems2.1.1. Concepts * Cropping systems A cropping system is a composition of breeds and varieties thatare arranged in areas and time in all kinds of agricultural ecosystems tomake the best of natural - economic and social conditions (Dao TheTuan, 1984). A cropping system is an arrangement of all plants in an 3interaction-relationship that is suitably arranged in areas and time(Nguyen Duy Tinh, 1995). *Improved cropping systems According to Pham Chi Thanh et al. (1996), an improvedcropping system includes local cropping system and advancedtechniques. This is the way of inheriting the good that was accumulatedby local people; therefore researching and developing the croppingsystem must evaluate the current cropping system. The word “current”means the techniques that have been accepted by local people.Advanced techniques are the new ones that have never ...