行/株距比对早晚稻产量和氮素吸收、 利用的影响

为双季水稻的合理配置行/株距比（RS/IS）提供理论依据。以早稻‘淦鑫203’、‘中嘉早17’和晚稻‘淦鑫688’、‘五丰优T025’为材料,在31.20万蔸/hm2密度下,研究了行/株距比对早晚稻产量和氮素吸收、利用的影响。早稻品种的产量以RS/IS2.8（30.0 cm×10.7 cm）和RS/IS2.0（25.0 cm×12.8 cm）处理较高,以RS/IS5.0（40.0 cm×8.0 cm）和RS/IS1.3（20.0 cm×16.0 cm）处理较低,而晚稻品种以RS/IS5.0和RS/IS2.0处理较高,以RS/IS2.8和RS/IS1.3处理较低。早稻氮素积累总量和氮肥表观利用率以RS/IS2.0处理较高,以RS/IS5.0处理较低,100 kg籽粒需氮量以RS/IS1.3处理较高,以RS/IS2.0处理较低;而晚稻氮素积累总量、100 kg籽粒需氮量和氮肥表观利用率以RS/IS2.8处理较高,以RS/IS5.0处理较低。可见,在该试验条件下,早晚稻4个品种采用25.0 cm×12.8 cm种植方式时的产量较高,采用20.0 cm×16.0 cm种植方式较低,氮素积累总量、100 kg籽粒需氮量和氮肥表观利用率以40.0cm×8.0cm较低。

Effects of Ratio of Row Spacing to Intrarow Spacing on Yield and Nitrogen Accumulation and Utilization of Early and Late Rice

Abstract: With early rice Zhongjiazao 17 and Ganxin 203 and late rice Ganxin 688 and WufengyouT025 as materials, the effects of RS/IS (Ratio of row spacing to intrarow row spacing) on yield, nitrogen accumulation and utilization were studied in the same planting density of 31.20×104 hills/hm2. The results showed that yield of early rice were higher in RS/IS2.8 (30.0 cm × 10.7 cm), RS/IS2.0 (25.0 cm × 12.8 cm) treatment and lower in RS/IS5.0 (40.0 cm × 8.0 cm), RS/IS1.3 (20.0 cm × 16.0 cm) treatment, while late rice were higher in RS/IS5.0, RS/IS2.0 treatment and lower in RS/IS2.8, RS/IS1.3 treatment. Total nitrogen accumulation and apparent utilization ratio of nitrogen were higher in RS/IS2.0 treatment and lower in RS/IS5.0 treatment, while,for late rice was higher in RS/IS2.8 treatment and lower in RS/IS5.0 treatment. Nitrogen requirement for 100 kg grain production was higher in RS/IS1.3 treatment and lower in RS/IS2.0 treatment, while, for late rice were higher in RS/IS2.8 treatment, lower in RS/IS5.0 treatment. Visible, early and late rice 4 varieties with higher yield in 25.0 cm × 12.8 cm, lower yield in 20.0 cm × 16.0 cm, and lower total nitrogen accumulation, nitrogen requirement for 100 kg grain production and apparent utilization ratio of nitrogen in 40.0 cm × 8.0 cm.