倒二叶露尖时施好小麦穗肥,主攻粒数和粒重,对夺取小麦丰收关系极大,尤其在去冬大面积小麦迟播、迟发的情况下显得更为重要。由于小麦在生长发育过程中,不同叶龄与各类器官之间保持着一定的同伸关系,故按叶龄施肥比每年按照一定的时期施肥,对控制各器官向预定的方向发展更准确可靠,更易于获得稳产高产。根据我们多年施肥试验,在小麦前促中控的基础上,于(?)倒二叶露尖(即叶龄余数1.5)时,每亩追施5公斤尿素加5公斤氯化钾作保花肥,可获得粒数和粒重双增的最佳设果,一般可增产1—2成。其经济效益高的科学性主要表现在以下四个方面: Sprinkle the tip of the second leaf when wheat spike fertilizer, the main grain and grain weight, the harvest of wheat harvest has a great relationship, especially in late winter wheat large area late, later appears even more important. Because of the process of wheat growth and development, different leaf ages and various organs maintain a certain relationship between the extension, so the leaf age by fertilization than the annual fertilization according to a certain period of time, the control of various organs to the intended direction of the development of more accurate and reliable , Easier to get steady and high yield. According to our fertilizing experiment for many years, on the basis of promoting and controlling before wheat, when the tip of the second leaf is exposed (that is, the leaf age is 1.5), 5 kg of urea and 5 kg of potassium chloride , Get the best results of the increase in the number of grains and grain weight doubled, generally increase 1-2 percent. The scientific nature of its high economic efficiency mainly in the following four aspects: