摘要
采用田间和盆栽试验研究了水作和旱作水稻施磷效应及土壤磷组分变化的差异。结果表明:旱作水稻增施磷肥对提高株高、分蘖数、根系体积以及增加各生育期茎叶、根系干重的初始效应大于水作水稻;水作水稻最大产量7350kg/hm2时的最大施磷(P2O5)量为104kg/hm2;旱作水稻最大产量6570kg/hm2时的最大施磷(P2O5)量为158kg/hm2,旱作水稻增施更多的磷肥应作为生产上的关键措施之一;施入土壤的磷肥主要转化为树脂 P、NaHCO3 P和NaOH P组分,水作和旱作水稻根际土壤中的树脂 P、NaHCO3 P和NaOH P耗竭量都大于非根际土壤,说明这3个磷组分是水作和旱作水稻的有效磷源。
Both field and pot experiments were done to study the effect of P application on rice cultivated under waterlogged and upland conditions and the changes of soil P components.The initial effects of P application on increasing plant height, tiller numbers, root volume, shoot and root dry matter weight of rice cultivated in upland (RCU) condition was higher than those of rice cultivated in waterlogged codition(RCW).To obtain the maxium yield of 7 350 kg/ hm2 for RCW and of 6 570 kg/ hm2 for RCU, 104 kg/hm2 and 158 kg/hm2 of P should be applied respectively.The P fertilizer applied to the soil was mainly transformed into ResinP, NaHCO3P and NaOHP, which were important and available P resources for both RCW and RCU.Three P components were exhausted to a greater extent in rhizosphere soil than in nonrhizosphere soil of the rice cultivated under waterlogged and upland conditions.
出处
《江苏农业学报》
CSCD
2002年第4期223-227,共5页
Jiangsu Journal of Agricultural Sciences
基金
江苏省农业新技术革命项目(BG98051)
关键词
水作
旱作
水稻
施磷效应
土壤
磷
rice cultivated in waterlogged condition
rice cultivated in upland condition
effect of P application
P component in soil
