施肥对苏丹草产草量和氮磷钾养分吸收的影响

研究施肥措施对苏丹草产草量以及对氮磷钾养分吸收的影响。结果表明:推荐施肥能显著提高产草量,比习惯施肥增产28.2%,比对照区增产150.0%。各处理的干物质日积累量均在出苗后第38~62d达最大值,分别为335.6、322.9和213.8 kg/hm²/d。在试验条件下,每生产1t苏丹草鲜草,推荐施肥需吸收N 2.59 kg、P₂O₅0.65 kg和K₂O 3.13 kg,其N:P₂O₅:K₂O=1:0.25:1.21;习惯施肥需吸收N 2.56 kg、P₂O₅0.76 kg和K₂O 3.30 kg,其N:P₂O₅:K₂O=1:0.30:1.29;对照区需吸收N 2.39 kg、P₂O₅0.98 kg和K₂O 3.06 kg,其N:P₂O₅:K₂O=1:0.41:1.28。

Effect of Fertilization to the Yield and NPK Nutrient Absorption of Sudangrass

A field experiment was conducted to study the effect of different fertilization measures to the yield and NPK nutrient absorption of Sudangrass.Results show that the recommended fertilization treatment increased the yield of Sudangrass remarkably during the whole grass growing period.The yield increased by（28.2%） compared to the habitual fertilizing practice,and by 150.0% compared to no fertilization.Normally,the period between 38 to 62 days after the seedlings emergence sees the largest amount of dry matter accumulation,reaching 335.6 kg/hm²/d with the recommended fertilizing,322.9 kg/hm²/d with the habitual fertilizing practice,and 213.8 kg/hm²/d without fertilization.Under the condition of the present experiment,to yield a ton of fresh Sudangrass with the recommended fertilization, 2.59 kg of N,0.65 kg of P₂O₅,and 3.13 kg of K₂O were needed,the ratio of the three fertilizers is N:P₂O₅:K₂O=1:0.25:1.21;to yield a ton of the grass with the habitual fertilization practice,2.56 kg of N,0.76 kg of P₂O₅,and 3.30 kg of K₂O were absorbed,and the ratio of the fertilizers is N:P₂O₅:K₂O=1:0.30:1.29.Even with no fertilizer applied to the Sudangrass,a ton of fresh grass yield would absorb from the soil 2.39 kg of N,0.98 kg of P₂O₅,and 3.06 kg of K₂O,and the ratio is N:P₂O₅:K₂O=1:0.41:1.28.