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油菜是我省主要油料作物。生产上在选用良种、培育壮苗和合理施肥的基础上,适时适量进行灌溉,保证油菜的需水量,对提高油菜产量有重要意义。一、油菜对水分的需求:油菜是需水较多的作物。据试验,油菜整个生长期中的耗水总量为300—450毫米,特别是蕾苔期和开花期,植株生长旺盛,需水最多,日耗水强度达3—4毫米。而我省常年冬干春旱,雨量稀少,盆地西部更为显著。据多年雨量记载,冬春两季降雨总量仅占年降雨量的20％,如以降雨量与同期水面蒸发相比则入不敷出,其差额为170毫米左右。由表1可见,油菜整个生育期中的总降雨量仅占总耗水量的33％左右。要使油菜获得丰产,除了光、温、养分以外,保证其适宜的土壤水分也是不
Rape is the main oilseed crop in our province. On the basis of selection of elite, nurturing strong seedlings and reasonable fertilization in production, timely and proper irrigation is carried out to ensure the water requirement of rape, which is of great significance to increase the yield of rapeseed. First, the demand for water rape: Rape is more water crops. According to the test, the total water consumption of rape throughout the growing period of 300-450 mm, especially in the bud and flowering period, vigorous plant growth, water demand up to 3-4 mm daily water intensity. In our province, the annual dry and dry spring drought, scarce rainfall, the western basin is more pronounced. According to years of rainfall records, the total amount of winter and spring rainfall only accounts for 20% of annual rainfall, such as the rainfall over the same period compared with the surface evaporation is unable to make ends meet, the difference is about 170 mm. As can be seen from Table 1, the total rainfall during rapeseed only accounts for about 33% of the total water consumption. To get rapeseed yield, in addition to light, temperature, nutrients, to ensure that the appropriate soil moisture is not