Effects of nutrient and water regimes on lodging resistance of rice不同养分和水分管理模式对水稻抗倒伏能力的影响
Keywords: Rice,Lodging resistance,Nutrient and water regimes,SiO,2 and K,2O content水稻,抗倒伏,养分和水分模式,硅和钾含量
Abstract:
A field experiment was conducted to study the effects of nutrient and water regimes on lodging resistance of rice plant by measuring and comparing the morphological and physical traits and the K 2O and SiO 2 contents of rice basal stems.The results indicated that a combined application of chemical fertilizers and organic materials,especially and rice straw (CS),could markedly increase the diameter,wall thickness and weight of basal stems,but reduce plant height,which resulted in the effective increase of snapping resistance (RS) and marked decrease of lodging index (LI).The effectiveness of the combined application of chemical fertilizers and rice straw (CS) on the increase of lodging resistance of rice plant was greater in alternate wetting and drying (AWD) and controlled irrigation (DRA),compared to continuous waterlogging (CWL).In addition,the combined application of chemical fertilizers and organic sources,especially with rice straw (CS),greatly increased the K 2O and SiO 2 contents in rice basal stems,especially in alternate wetting and drying (AWD) and controlled irrigation (DRA).Correlation analysis showed that the wall thickness,weight and snapping resistance of basal stems were significantly positively correlated to the K 2O and SiO 2 contents in rice basal stems (P<0.05 or P<0.01) in alternate wetting and drying (AWD) and controlled irrigation (DRA).
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