甘肃省灌漠土养分的研究

温室盆栽与田间试验研究河西走廊民勤灌漠土养分结果表明 ,盆栽灌漠土缺N、P、Cu、Fe和Zn ,未施N、P、Cu、Fe和Zn处理的高粱相对产量分别为 4 7.38%、6 8.77%、70 .91%、78.4 0 %和 80 .2 1% ;而N肥和P肥为大田该灌漠土主要限制因子 ,大田试验最佳处理 (OPT)增施N、P肥可显著提高玉米产量 ,增幅分别为 11.95 %和2 2 .6 0 % ,而减N处理玉米产量则显著降低 ,减幅为 10 .4 0 %。

Systemic study on nutrients in irrigation desert soils of Gansu Province

In this paper, with the pot experiment and field experiment, the status of nutrients of irrigation desert soils at Minqin County in Gansu Province is studied. The results show that the limiting factors nutrients of irrigation desert soils are the deficiency of N, P, Cu, Fe, and Zn. The relative yields of sorghum from the soils non-applied with N, P, Cu, Fe and Zn are 47.38%, 68.77%, 70.91%, 78.40%, and 80.21% respectively. In field experiment, the limiting factors nutrients are N and P fertilizers. Based on the treatment of OPT, the application of N and P fertilizers can enhance the yield of corn prominently and the increasing amplitudes are 11.95% and 22.60% respectively, while reducing the N application decreases the yield prominently and the decreasing amplitude is 10.40%.