不同水肥条件对四种豆科牧草生长的影响

本文用正交试验,分析土壤肥力及水分对四种豆科牧草的生物量及生长的影响,表明在温室条件下,水分对生物量增产作用最显著;水分对根系的生长也比肥力的影响显著;根瘤的形成及生长和水分关系十分明显,较湿的土壤有利于根瘤的形成,而肥力的作用和水分的作用相反,低肥土壤有利于根瘤的形成及生长;在生长中期以后,较多的水分及肥力对生长的促进作用十分显著,而在生长前期,适量的肥力及水分即可满足生长的需要.蝴蝶豆Centrosema pubescens的生物量最高,其次为旋扭山绿豆Desmodium intortum、大叶千斤拔Maghania macrophylla及圆叶舞草Codariocalyx gyroides.即使在旱瘦的条件下,蝴蝶豆的生物量也最高,其次为圆叶舞草,大叶千斤拔最低;根系生物量以大叶千斤拔最高,旋扭山绿豆最低.

THE EFFECTS OF DIFFERENT WATER AND FERTILITY CONDITIONS ON THE GROWTH OF FOUR LEGUME FORAGE SPECIES

The relationship between fertility and water conditions and growth of four legume species is analysed through orthogonal test. Under the conditions of greenhouse, the effect of water condition is most evident for biomass and for growth of roots. The biomass and noudles are positively related to water, and negatively related to fertility. On the primary stage of growth, the difference in different treatments is small, that is, the plants then need moderate water and fertility and afterwards the difference is much more evident. The biomass of Centrosema pubescens is the highest and orderly, come that of Desmodium intortum, of Maghania macrophylla and of Codariocalyx gyroides. Under the condition of low water and fertility, C. pubescens has also the highest biomass, followed by C. gyroides, D. intortum and M. macrophylla. Biomass of roots of M. macrophylla is the highest while that of D. intortum is the lowest.