施肥对盐碱地苜蓿产量和品质的影响

采用田间试验,研究了在盐碱土壤条件下腐植酸、磷酸二铵及微量元素配施对紫花苜蓿(Medicago sativa L.)生长的影响,并采用灰色系统理论中的灰色关联度分析法对紫花苜蓿12个主要营养指标进行综合分析和评价。结果表明:以腐植酸、磷酸二铵和微量元素为主的底肥能有效增加紫花苜蓿全年干物质产量,平均增产达到39.6%;返青期追肥对产量影响不显著。施肥均能促进紫花苜蓿株高的增长,并且第一、二茬株高均大于第三茬。不同施肥处理下,紫花苜蓿营养价值加权关联度和等权关联度的结果一致,施肥处理的优劣顺序依次为T3(底肥)、T1(底肥+返青期追肥)、T2(返青期追肥)和T4(不施肥),T3在加权和等权综合评估关联度分别为0.2175和0.2156。

Effect of Fertilization on Yield and Quality of Alfalfa in Saline-alkali Soil

Field experiments were conducted to study the effect of combined application of humic acid, diammonium phosphate and microelement on alfalfa (Medicago sativa) growth, and to analyze and evaluate 12 main nutritive indexes by gray relational analysis grade method. The results showed that the total yield of alfalfa increased by 39.6% with humic acid, diammonium phosphate and microelement applied as base fertilizer. Topdressing in seedling establishment period had little effect on yield. Fertilization could improve plant height of alfalfa, and the plant height in first cut and second cut was higher than that of third cut. The results of the weighted correlation degree and the equal right correlation degree of alfalfa nutrition were the same under different treatments, the effect followed the order of T3 (base fertilizer), T1 (base fertilizer + topdressing in seedling establishment period), T2 (topdressing in seedling establishment period) and T4 (without fertilization), the comprehensive evaluation correlation degree of weighted and equal relation were 0.2175 and 0.2156 under T3 treatment.