Dissertation
Dissertation > Agricultural Sciences > Crop > Cereal crops > Rice

Study on Decomposing Dynamic of Tumorous Stem Mustard Leaves in Soil and Its Nutrient Effect to Rice

Author WenMingXia
Tutor ShiXiaoJun
School Southwest Agricultural University
Course Plant Nutrition
Keywords Mustard leaves the field Rice Nutritional Effects Nutrient Management
CLC S511
Type Master's thesis
Year 2005
Downloads 72
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Investigation and study, pot experiment was conducted field trials and laboratory analysis method of combining the status of Chongqing Fuling rice - mustard system, nutrient use of resources research, understanding of Fuling District of rice - mustard system nutrients Resource Management; According to the survey results from 2004 to 2005 the mustard leaf nutrients in the soil release dynamics of mustard leaves, and through field trials and pot experiments to field on rice growth, nutrient uptake and soil fertility, mustard leaf nutrient rational use of resources and optimization of management to provide a scientific basis. The survey results show that the Fuling District of Chongqing rice - mustard rotation system, mustard season nitrogen fertilizer is generally high among farmers fertilizer quite different, lack of fertilizer with excessive issues exist. Nitrogen fertilizer rates as low as 13.8kg N/666.7m 2 , the highest 37.6kg N/666.7m 2 , the average nitrogen rate 23.3kg N/666.7m in 2 , which has 60% of the farmers large amount of nitrogen fertilizer in 22kg N/666.7m 2 . Nitrogenous fertilizer in the distribution of the whole growth period before light after fertilizer requirement of the law is inconsistent with the mustard, farmers generally 2 to 3 nitrogen fertilizer application, most farmers in proportion to the allocation 20:30:50 absorption of fat, according to mustard law, The scientific distribution should be 20:70:10. NPK application imbalance, partial nitrogen, less than the amount of potash fertilizer, application of NPK the (containing fertilizer inputs) average N: 25.6kg/666.7m 2 , of P 2 O 5 : 8.5kg/666.7m 2 , K 2 O: 9.6kg/666.7m 2 , NPK fertilizer ratio (N: P 2 O 5 : K 2 O) 1:0.332:0.375 mustard nutrient demand ratio (N: P 2 O 5 : K 2 O) is 1:0.2 to 0.4:1 to 1.7 . Inputs of nutrients in fertilizer NPK respectively of the total fertilizer 91.0%, 65.9% and 15.6%, nitrogen fertilizer, potassium is mainly composed of organic fertilizer; more than 50% of the farmers in the application of chemical fertilizers, other The K fertilizer farmers in the amount of potassium is low, every 666.7m 2 1.5 ~ 7kg K 2 O, most 2.5kg K 2 O, the amount of potash significantly lower. Mustard harvest, commonly used mustard leaves field directly without any application of fertilizer, more than 80% of the farmers in the rice season, individual farmers applying a small amount of nitrogen fertilizer (69kg N / ha 2 ) to farmers this experience fertilization is still a lack of scientific research. Field and indoor culture test results show that, in the field under natural environmental conditions, mustard leaves about 50 days to field substantially complete decomposition (decomposition rate of 96.2%), which in recent months from the mustard harvest to rice planting the time, mustard leaves can be completely decomposed, will not have a negative impact on the post-season rice. The mustard leaves the field can improve the content of inorganic nitrogen in the soil during the whole incubation period is a net mineralization; wheat straw and straw were lower than that of the control soil inorganic nitrogen content in the whole incubation period, the performance of net fixed; rapeseed stalk beginning of the incubation net mineralization, late net fixed. All straw processing have increased the content of soil available P and K, with respect to these types of organic materials, mustard leaves in N, P nutrient supply of the best. - Rice rotation plots in long-term mustard, mustard large number of long-term fertilization and leaves to field fertility effect, even if the post-season rice is not applied any fertilizer can obtain high yield rice production reached 9.2t/hm2, etc. the amount of nutrients in mustard leaves the field, fertilizer and combined application of the two rice yield difference was not significant, mustard leaves and fertilizer nutrients have the same nutritional benefits. The the pot experiment yields results show that: in the barren soil, organic fertilizer combined with chemical fertilizers to ensure nutrient

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