不同施肥水平与组合对饲用黑麦生产性能的影响研究Ⅱ对饲用黑麦质量的影响

应用回归均匀设计构造试验方案,研究氮肥、磷肥、钾肥不同水平与组合对饲用黑麦干草质量的动态关系.结果表明,饲用黑麦干草中粗蛋白质(CP)含量主要受施氮水平的影响,受磷、钾施肥水平的影响很小;饲用黑麦干草中性洗涤纤维(NDF)含量、酸性洗涤纤维(ADF)含量不仅受施氮水平的影响,同时也受磷、钾施肥水平的影响;饲草质量随施氮水平的增加而增加,随磷、钾肥施入水平的增加而降低,总体而言,施肥量特别是氮肥施入量对饲用黑麦干草品质有较大影响.在试验范围内,为了获得较高的饲用黑麦干草质量(CP>14%),氮肥(N)施量不应低于226.5 kg/hm2, P2O5、K2O应少施为好.

Effects of different varieties and fertilizer rates on the production of forage Secale cereale Ⅱ: Effects on the hay quality of forage Secale cereale

This paper details an experiment which was carried out from October 1997 to April 1998 at the Wuqiao experiment fields of the China Agricultural University in Hebei Province. The aim of the experiment was to study the effects of nitrogen, phosphate, and potassium fertilizer practices on the quality of forage Secale cereale. Mathematical models were established for the quality of rye hay based on the N, P and K fertilizer treatments. The dynamic relationship between experimental factors and the quality of Secale cereale have been diagrammatically represented with graphs in this paper. The results showed that one of the most significant factors that influenced the hay quality of forage Secale cereale was the N fertilizer practice. The CP, NDF and ADF contents of forage varied significantly with different treatments. With increasing N application rates, forage CP tended to increase, whereas NDF and ADF declined. With increasing applications of P and K, forage NDF and ADF tended to increase. In conclusion, it is believed that to improve the hay quality of forage Secale cereale it is necessary to apply relatively higher N fertilizer rates and relatively lower P and K fertilizer rates.