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棉苗在大田内,由于种子质量、土壤干湿,病虫等原因造成出苗不齐,高矮不匀、生长失衡而形成弱小苗。以致大苗欺小苗、弱小苗植株发育不良,影响通风透光。既给田间管理带来不便,又影响棉花的产量及品质。因此,必须对弱小苗进行促壮,使其充分利用地力和光能,以更好地发挥棉苗的群体优势。1、对于露地栽植的棉苗,可在弱小苗周围覆盖地膜,四周用土压严,膜下用土坷垃垫起,这样可提高地温,使弱小苗快速生长。2、在弱小苗根部10厘米处,用打孔枪或木棒打孔,孔深10厘米,将尿素、过磷酸钙等速效性肥料施入孔内并用土埋严。如土壤干旱,用过磷酸钙5公斤,加水20公斤浸泡24小时后过滤去渣,再加入215公斤尿素,搅匀
Cotton seedlings in the field, due to the quality of seeds, soil wet and dry, pests and other causes of emerging, uneven height, the growth of imbalance and the formation of weak seedlings. As a result, bulrush seedlings and weak seedling plants are underdeveloped, affecting ventilation and light. Not only inconvenience to the field management, but also affect the yield and quality of cotton. Therefore, weak seedlings must be promoted to make full use of geo-energy and light energy so as to give full play to the group advantages of cotton seedlings. 1, for the open field planted cotton seedlings, mulch can cover the weak seedlings around the soil with strict pressure, under the rubbed soil Rubbings, this can increase the ground temperature, so that the rapid growth of weak seedlings. 2, 10 cm in the root of weak seedlings, perforated with perforating gun or stick, hole depth of 10 cm, urea, superphosphate and other quick-acting fertilizer applied to the hole and buried with soil. Such as soil drought, with superphosphate 5 kg, 20 kg of water soak for 24 hours after the filter to the residue, then add 215 kg of urea, stir well