不同立地条件和施肥处理下苏丹草产量及经济效益分析

Analysis of forage yield and economic benefit of sudangrass under different site conditions and fertilizations

在江汉平原连续2年布置大田试验,研究了不同立地条件下氮、钾肥配合施用对鱼饲用苏丹草（Sorghum sudanense）产草量及经济效益的影响。结果表明,在鱼池田埂上种植时各氮钾配施处理均明显提高苏丹草鲜草产量,比对照增产1.2~2.3倍;在农田中各氮钾肥配施处理产草量也显著高于对照,增产0.84~2.20倍,但较鱼池田埂上苏丹草产草量相对较低。2种立地条件下均以处理N540K180（施N、K2O分别为540、180 kg/hm2）的苏丹草产量最高,分别为82.1和57.0 t/hm2。经济效益分析结果显示,在种植苏丹草时,氮钾肥配施是一项增产增收的好措施,鱼池田埂上平均增收3 991元/hm2,农田种植时平均增收2 897元/hm2;净利润也均以处理N540K180最高,分别为5 087和4 385元/hm2。

Field experiments were conducted to study the effects of N and K application on the forage yield and economic benefit of sudangrass under different site conditions on Datonghu Farm,Hubei in 2007 and 2008.The results showed that the fresh grass yield of the all treatments of N and K combined application increased 1.2 to 2.3 times over the treatment N0K0 when planted in field bund.In farmland,fresh grass yield of each treatment of N and K combined application was also significantly higher than that of the CK and the grass yield was increased by 0.84 to 2.20 times respectively,but the grasses yields were much lower than that under field bund condition.Under two site conditions,the treatment of N540K180 obtained highest grass yields as 82.1 t/hm2 and 57.0 t/hm2.The economic benefit analysis indicated that the combined application of N and K fertilizers increased income by 3 991 yuan/hm2 and 2 897 yuan/hm2 on average in field bund and farmland,and the net profit of N540K180 were the highest and achieved to 5 087 yuan/hm2 and 4 385 yuan/hm2 in field bund and farmland respectively.