论文部分内容阅读
从1982年以来,连续四年在杨陵旱塬(土娄)土进行的不同施肥处理的田间定位试验结果看出:在年降水600毫米以上的常雨和多雨年,夏闲期降水在350—400毫米以上,夏闲期蓄墒能使2米深土层的贮水获得充分恢复;300毫米以下的降水,仅能使土壤贮水获得部分恢复;在小麦整个生育期中,土壤水分表现为较长时间的失墒过程,一般至收获期降至最低。生育期内的降水,对土壤墒情会产生良好的作用。施肥能显著提高降水生产率,个别处理达到每毫米降水能生产1公斤小麦,这主要是由于施肥增强了根系吸收利用土壤贮水的能力,提高了土壤在夏闲期的蓄墒能力及施肥促进作物生长,减少了地面蒸发,提高了植物水势,增强了抗旱的能力。
Since 1982, field experiment results of different fertilization treatments conducted in Yangling dry land (Lo soil) for four consecutive years show that in the normal and rainy years with an annual precipitation of more than 600 mm, the precipitation during summer and summer is between 350- 400 mm or more, soil moisture during summer fallow period can fully recover the water stored in the 2-meter deep soil layer. Precipitation below 300 mm can only partially restore soil water storage. During the whole wheat growth period, A long time loss of moisture process, generally to harvest to a minimum. Precipitation during the growth period, the soil moisture will have a good effect. Fertilization can significantly increase precipitation productivity, and individual treatment can produce 1 kg of wheat per millimeter of precipitation. This is mainly due to the fact that fertilization enhances the capacity of the root system to absorb and utilize soil water storage, enhance soil moisture storage during summer and summer, and fertilize and promote crops Growth, reducing evaporation on the ground, raising the plant water potential and enhance the ability of drought.