半干旱区的新修梯田作物选择与轮作制度

在半干旱地区,梯田修筑质量一定时,先锋作物的选择及增施化肥是保证新修梯田增产的重要措施。关川河流域的监测资料表明,新修梯田前4年,年平均亩产达到102.02kg,比老梯田增产9.28％,比坡耕地增产67.41％。保证新修梯田增产的主要措施是,以洋芋、春小麦、扁豆、荞麦为先锋作物,实行合理的轮作制度,并根据作物产量需求增施相应数量的化肥。

Crop Choice and Rotation System for Newly Built Terraced Land in Semiarid Region

In the semiarid region, under a condition of good construction quality, proper choosing pioneer crops and adequately fertilizing is to be an important measure to ensure good productivity on newly built terraced farmland. On the Guanchuan watershed, the monitoring data indicate that the average productivity per mu for the first 4 years is 102. 02 kg, 9. 28% higher than that of the old terraced farmland and 67. 41% high-er than that of the slope farmland. The main measures are taking potato, spring wheat , hyacinth beans and buckwheat as the pioneer crops, rational rotation system and fertilizing in accordance with the crop require-ment of a certain productivity.