Effect of nutrient management on the growth and yield of double cropping late rice under drought stress during tillering stage
In order to promote rice production in the harsh environments of mountain and hills areas,we conducted five nutrient management methods including adding K fertilizer + spraying clean water(T1),foliage spraying 0.2％ ZnSO4(T2),adding K fertilizer + foliage spraying 0.2％ ZnSO4(T3),raising the ratio of N fertilizer in elongation stage + spraying clean water(T4),conventional fertilization + spraying clean water (CK),with the objective of elucidating the effect of the nutrient management methods on the growth and development,yield components and yield of double cropping late rice under drought stress condition.The results revealed significant difference among the five nutrient management methods () the growth and development and yield of double cropping late rice under drought stress condition during tillering stage,with the order of T3 ＞ T1 ＞ T2 ＞ T4 ＞ CK.T3 effectively increased tiller number,the seedling peak value,and number of effective tillers,significantly elevated the SPAD value,the photosynthetic rate and transpiration rate of leaf,root activity at elongation stage and full heading stage,with a range of increase by 2.19％ ～ 25.22％ compared with CK.In addition,it significantly increased single plant dry matter weight above ground at stem elongation stage and full heading stage and maturity stage,improving the dry matter accumulation of plant by 5.47 ％ and 8.05 ％ and 7.22 ％ compared with CK,respectively.Furthermore,the yield components including the effective panicles number per hectare,filled grain number per panicle,total grain number per panicle and seed setting rate were significantly enhanced.Finally,the highest yield level was achieved for T3 under drought stress,reaching 10.07 t· hm-2 and being 6.34％,7.70％,14.17％ and 25.56％ higher than T1,T2,T4,and CK respectively.
double cropping late ricedrought stressnutrient managementgrowth and developmentyield
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维普
