作物学报Issue(10)：1548-1556,9.DOI:10.3724/SP.J.1006.2015.01548
秸秆还田替代化学钾肥对棉麦轮作中棉仁油分累积的效应
Effects of Straw-Returning Instead of Chemical Potassium Application on Oil Accumulation in Cottonseed Embryo in Wheat-Cotton Rotation System
摘要
Abstract
A field experiment was carried out to study the influence of straw returning to field (taking the place of chemical potas-sium fertilization) on cottonseed lipid content and its physiological mechanism in 2012—2013 in the research station of Jiangsu Academy of Agricultural Sciences in Nanjing. Application rates of wheat straw were designed as 0, 4500, and 9000 kg ha–1(W0, W1, and W2) in cotton season. Similarly, application rates of cotton straw were designed as 0, 3750, and 7500 kg ha–1(C0, C1, and C2) in wheat reason. There were nine straw-returning treatments with combinations of two kinds of crop straw at returning differ-ent amounts. Additionally, according to the straw potassium content, K fertilizer rates were newly designed as 150 and 300 kg K2O ha–1 (K1 and K2) in cotton season in 2012. The results showed that under the condition of optimized nitrogen (300 kg N ha–1) and phosphate (150 kg P2O5 ha–1) fertilization levels, with straw returning and the chemical potassium fertilizer application year by year, the differences of soil available nitrogen and phosphorus between years were not significant, while those of soil K content were significantly different. The 17th day and 24th day after anthesis (DAA) were the key period for the difference of cottonseed oil formation. Under the chemical potassium fertilization and the straw returning condition, the phosphatidic acid phosphatase (PPase) contributed more to cottonseed oil accumulation than glucose 6-phosphate dehydrogenase (G6PDH) and phosphoenolpy-ruvate carboxylase (PEPC) in response to soil potassium nutrition. The result indicated that, the soil available K content was the major nutrition factor that was significantly affected by the two-year straw returning and the chemical potassium fertilizer applica-tion. Straw returning to field can take the place of chemical potassium application to a high extent. The amount of straw returning will affect potassium content of the soil. Low potassium stress will accelerate the aging of cotton plant, and might be a straight reason that caused the difference of oil content. The potassium content in the cottonseed at 17th day, 24th day after anthesis is a key nutrition factor that may lead to the difference of cottonseed oil content. The phosphatidic acid phosphatase (PPase) plays a more important role than glucose 6-phosphate dehydrogenase (G6PDH), phosphoenolpyruvate carboxylase (PEPC) in cottonseed oil accumulation in response to soil potassium nutrition.关键词
棉仁/油分/秸秆还田/钾肥Key words
Cottonseed embryo/Oil content/Returning straw/Potassium fertilizer引用本文复制引用
宋光雷,睢宁,余超然,张凡,孟亚利,陈兵林,赵文青,王友华..秸秆还田替代化学钾肥对棉麦轮作中棉仁油分累积的效应[J].作物学报,2015,(10):1548-1556,9.基金项目
本研究由国家自然科学基金项目(31371583)资助。 （31371583）
