施肥对狗牙根种子生产的影响

Effect of Nitrogen Phosphorus and Potassium on the Seed Production of Cynodon dactylon (L.) Pers cv. Xinnong No.1

研究施肥对新农1号狗牙根种子生产的影响，对不同处理间种子产量及其构成差异进行对比分析，结果表明：单施氮、磷、钾肥对枝条数的影响显著，以氮肥的作用最大，其效应表现为氮肥〉磷肥≥钾肥；单施氮、磷、钾肥能显著提高新农1号狗牙根种子产量，并影响种子产量构成，其生殖枝数、小穗数、种子数、千粒重等都比对照有所提高。单施N 100kg／hm^2，K2O 150kg／hm^2，P2O5 100kg／hm^2能获得较高的种子产量，达219．4～296．2kg／hm^2，其种子产量比对照提高10．92％～49．74％。

A fertilization experiment of Cynodon dactylon （L.） Pers cv. Xinnong No. 1 has been conducted to analyze the difference of the seed production and compare the different seed yield with different treatments. The experimental results indicated that if anyone of nitrogen, phosphorus or potassium is applied only,the branch number will be significantly increased. Based on the effect of application of the three kinds of fertilizer,nitrogen ranks first. The seed yield of Cynodon dactylon （L.） Pers cv. Xinnong No. 1 can be significantly increased and the yield component also can be influenced,with applying one of the three fertilizers only. The reproductive tillers, spikelets, seed number, thousand-grain-weight were increased in comparison with the control. When applying nitrogen, phosphorus or potassium separately, the seed yield can be increased. In the final experiment,the seed yield was increased by 10.92%-49.74% compared with the control.