【摘要】 通过氮肥和氮磷肥对草木樨生产性能影响的研究 ,证明磷肥能增加草木樨地上和地下生物量积累及种子产量 ,同时磷肥还提高了草木樨的粗蛋白含量和积累量 ,提高了根瘤鲜重 ,盛花期以前 ,磷肥增加了草木樨的 NDF和 ADF含量 ,盛花后减缓了纤维化过程。氮磷肥配施提高了草木樨产量和粗蛋白含量 ,对 NDF和 ADF含量的影响类似于单施磷肥 ,方差分析表明施氮磷肥间在初花期存在显著互作关系 ,施磷肥对初花期和绿荚期产量的贡献率大于施氮肥。对初花期和绿荚期草木樨产量的回归分析得到了单施磷肥和氮磷肥配施的二次肥料效应方程 ,并作出了氮磷肥配施在这 2个物候期的肥料效应曲面更多还原

【Abstract】 Effects of nitrogen and phosphorus fertilizers applied separately or combined on sweetclover (Melilotus sp.) productivity were studied in the field. It was proved that phosphorus fertilizer increased the above and underground biomass, seed yield, CP content and nodule fresh weight of sweetclover. Effects of P fertilizer on NDF and ADF content in the plant varied with the growing stage of sweetclover. The contents of both nutrient components were increased by P fertilizer befor full blooming stage and were decreased afterwards, similar effects were found in the plants received the mixtures of N and P fertilizers. Fertilization of nitrogen and phosphorus together also increased the hay yield and CP content of sweetclover. The ANOVE analysis indicated that there was an interaction between nitrogen and phosphorus fertilizers on hay yield at early blooming stage, and P had a greater contribution than N to hay yield. Regression equations for herbage yields at early blooming and podding stages and N and P fertilizers were established. Two fertilizer bent surfaces were also developed for both growing stages of sweetclover.更多还原