播种比例和施氮量及刈割期对燕麦与豌豆混播草地产草量和质量的影响

The Effects of Seeding Rate, Nitrogen Fertilizer and Harvest Time on the Yield and Quality of Oat-Pea Mixture

于1998年4～9月在华北农牧交错带承德市鱼儿山牧场进行不同播量、施氮量和刈割期对一年生燕麦与豌豆混播人工草地产草量和品质影响的研究。试验结果表明，不同播种比例间的产草量、粗蛋白、NDF、ADF含量差异显著（P＜0.05）。单播燕麦产草量最高，说明混播组合中燕麦是高产的决定因素。随着豌豆播种比例的增加，粗蛋白质含量随之增加，而NDF、ADF含量则有所降低。在土壤不缺氮的情况下，施氢能对产草量、品质的影响不明显，但以高氟水平效果最好。在供试的三个刈割期中，以第三刈期最佳，即燕麦乳熟末期至蜡熟初期，豌豆底部豆荚充满时期，此时刈割可获得最佳产草量和质量。播种比例以燕麦50％＋豌豆50％最好，产草量高，品质好，而且便于调制优质干草。

The effects of different seeding rates combined with N fertilizer and harvest time on theyield and quality of oat-pea mixture were studied on the border of crop and range regions in North Chinafrom Apri1 to September in 1998. The results showed that forage yield and the contents of CP,NDF andADF significantly varied with seeding rates. The optimum yield of forage gained in oat monoculture,andoat made a major contribution to forage yield in oat-pea mixture. With increasing the proportion of pea,for-age CP tended to increase,but NDF and ADF declined. With nitrogen available in soil,application N willhave no significant effect on forage yield and quality. However,the pea-oat mixture gave best performancein optimum rate of N fertilizer. The optimal harvest time was from late milk to soft dough stage of oat andlower pods of pea well filled. The optimal seeding rate was 5O% oat+ 5O%pea,both the forage yield andquality were better in this treatment.