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大连地区的两茬种植,以上茬冬小麦,下茬向日葵为较理想的搭配形式。喷灌是保证两茬作物高产稳产的重要灌溉方法。据试验,喷灌比地面灌每亩节水70.5～71.8％,增产39.6～48.9％。喷灌比不灌增产101.2～206.7％。 1.两茬作物的适宜土壤湿度与需水规律 两茬作物的前期和后期耗水量较小,中期较大。据实验,冬小麦拔节到黄熟期,向日葵现蕾到灌浆期,适宜的土壤湿度为75～80％,低于此线时,应立即灌水。
Dalian two cropping, the above crop winter wheat, the next crop sunflower is the ideal form with. Sprinkling irrigation is to ensure that two stubble crop high and stable yield of important irrigation methods. According to the test, sprinkler irrigation water per acre than the ground 70.5 ~ 71.8%, an increase of 39.6 ~ 48.9%. Sprinkler irrigation output increased from 101.2 to 206.7%. 1. Two stubble crops suitable for soil moisture and water requirements The two crops in early and late water consumption is smaller, medium-term larger. According to the experiment, winter wheat jointing to yellow ripening, sunflower budding to filling stage, the appropriate soil moisture is 75 ~ 80%, below this line, should be immediately irrigated.