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棉田喷施硼、铜、锌、锰等微量元素肥料,可以增加棉花的产量。据1956年北京师范大学生物系在苏联专家指导下所进行的试验(供试品种是密字棉),用微量元素于棉花开花初期(7月13日)和结铃期(9月初)各喷射一次,其结果以硼的效果最好,用0.05%硼酸液喷施二次的每亩增收籽棉74.5斤,即增产26.4%;铜增产48.7斤;锌增产41.5斤;锰增产23.9斤。
Spraying cotton, boron, copper, zinc, manganese and other trace elements of fertilizers, can increase cotton production. According to the experiment carried out by the Department of Biology of Beijing Normal University in 1956 under the guidance of the Soviet experts (the test variety is a dense cotton type), the trace elements were sprayed on the cotton during the initial flowering period (July 13) and the bolting period (early September) Once, the results of the best boron effect, with 0.05% boric acid spray secondary injection of seed cotton per acre 74.5 kg, an increase of 26.4%; copper yield 48.7 kg; zinc yield 41.5 kg; manganese yield 23.9 kg.