一些牧草的耐酸性及磷,钾,镁肥对牧草的影响

试验研究了 ６ 种多年生牧草的耐酸性及酸性土壤磷、钾、镁肥对牧草的影响⒚结果显示：耐酸性为羊茅草、毛花雀稗＞ 白三叶草、多年生黑麦草＞ 草地羊茅、红三叶草⒚耐酸牧草在不同 ｐ Ｈ 条件下植株的含铝量、含磷量差异不大；耐酸性弱的牧草 在低 ｐ Ｈ 条件下，植株含铝 量显著较高⒚缺磷、缺 钾和缺镁处理的产量分别 为完全肥料处理 的 １１％ ～１７％ ，８７％ ～９３％ ，７７％ ～９０％ ，显 示这些土壤中缺 磷是限制牧草产量的主要营养元素⒚缺磷处理植株磷、钾含量显著较低，氮含量显著较高⒚

Acid tolerance of some forage grasses and effects of phosphate , potassium, magnesium application on growth of the grasses

Experiments were conducted to study the acid tolerance of six perennial forage species and the effects of phosphorous, potassium, magnesium fertilizers application on the growth of forage crops grown on acid soil The results showed that the sequence of acid tolerance among the six species were as follows: Festuca ovina L , Paspalum dilatatum Poir > Lolium perenne L , Trifolium repens L > Festuca pretensis Huds, Trifolium pratense L There were no obvious differences in aluminum and phosphorous concentrations among the acid tolerant forages at different pH At low pH, acid sensitive forage crop species containes significant higher aluminum concentrations The yields of the treatments of -P and -K or -Mg were 11% 17%, 87% 93% and 77% 90% of the control (with complete fertilizers), respectively The results suggested phosphorous deficiency was the key factor for limiting forage crop yields Phosphorous and potassium concentrations of plants with the treatment of -P decreased significantly, while nitrogen concentrations of the plants increased when compared to those of control