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采用单因素随机区组设计,研究不同钾肥(K2O)施用量(0、75、150、225、300、375kg/hm~2)对龙薯28号产量和农艺性状的影响。结果表明:茎粗主要由品种特性决定的,适量的钾肥能显著提高单株分枝数、蔓长、蔓重、薯块重和单株大中薯率;施钾能促进薯块干物质的积累,提高薯块干物率,且低钾对薯块干物率的贡献高于高钾条件。龙薯28号属于迟衰型甘薯品种。施钾能够提高膨大期(90~120d)的块根膨大速率的峰值,降低T/R(蔓重/薯重)比值。在土壤速效钾含118.6mg/kg水平下,施纯N 120kg/hm~2、P2O5 75kg/hm~2、K2O 300kg/hm~2,龙薯28号可获得最高鲜薯产量40 416.94kg/hm~2,最高薯干产量13 479.05kg/hm~2,最高淀粉产量9 154.55kg/hm~2,最高经济效益79 113.88元/hm~2。
Single factor randomized block design was used to study the effects of K2O application rates (0, 75, 150, 225, 300 and 375 kg / hm ~ 2) on the yield and agronomic characters of Longshu No.28. The results showed that the stem diameter was mainly determined by the characteristics of the varieties. Appropriate amounts of potassium fertilizer could significantly increase the number of branches per plant, the length of vine, the weight of tuber, Accumulation, increase the rate of dry matter of potato, and potassium contribution to dry matter rate of potato is higher than the high potassium conditions. Longshu No. 28 belong to the late-type sweet potato varieties. Potassium application increased the peak of tuberous expansion rate and decreased the ratio of T / R (Man-Gram / Potato Weight) in the swelling phase (90-120 d). Under the available potassium content of 118.6mg / kg, N 120kg / hm ~ 2, P2O5 75kg / hm ~ 2 and K2O 300kg / hm ~ 2, the highest yield of fresh potatoes was 40 416.94kg / hm ~ 2, the highest dry matter yield was 13 479.05kg / hm ~ 2, the highest starch yield was 9 154.55kg / hm ~ 2 and the highest economic benefit was 79 113.88yuan / hm ~ 2.