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采用二次回归正交组合设计,研究氮磷钾用量及配比对甜玉米产量与品质的影响表明:氮磷钾用量对商品鲜苞产量有显著增产作用,其影响顺序为:氮>钾>磷。在本试验条件下,每亩施N、P_2O_5、K_2O分别为18.2kg、6.3kg、18kg时,可获最高鲜苞产量640kg/亩。钾可显著提高鲜粒水溶性糖含量。氮、磷则在某一用量(每亩N6.7kg、P_2O_55kg)时,鲜粒水溶性糖含量最低,氮、磷分别小于以上用量时,水溶性糖随养分增加而下降,大于以上用量时,糖分随养分增加而增加。综合商品鲜苞产量与糖分含量两项指标,可推荐甜玉米合适施肥量为N18.2kg/亩,P_2O_56.3kg/亩,K_2O18kg/亩,其配比为N:P_2O_5:K_2O=1:0.35:1。
The quadratic regression orthogonal design was used to study the effects of N, P and K fertilizers on the yield and quality of sweet corn. The results showed that the N, P and K dosages significantly increased the yield of fresh- phosphorus. Under the test conditions, the maximum yield of fresh-buds can be 640kg / mu when N, P_2O_5 and K_2O per mu are 18.2kg, 6.3kg and 18kg respectively. Potassium can significantly increase the water-soluble sugar content of fresh grains. Nitrogen and phosphorus in a certain amount (N6.7kg per acre, P_2O_55kg), the lowest water-soluble sugar content of fresh water, nitrogen and phosphorus were less than the above amount of water-soluble sugar decreased with the increase of nutrients, more than the above amount, Sugar increases with increasing nutrients. According to the two indexes of fresh-product yield and sugar content, the suitable fertilization amount of sweet corn can be N18.2kg / mu, P_2O_56.3kg / mu, K_2O18kg / mu, the ratio of N: P_2O_5: K_2O = 1: 0.35: 1.