豆科牧草套种芒果园生产力及土壤营养变化初报

Report on Production and Soil Nutrients Variation of Mango Orchard Inerplanted with Leguminous Forage

针对广西山多地少,果园下大面积土地未得以充分利用而造成土地浪费的现状,研究利用芒果园中套种优质豆科牧草白花扁豆,同时设置未套种牧草的相邻空白芒果园区作为对照,各种牧草套种区及空白区面积均为90 m^2,测定牧草产量、芒果营养及土壤肥力,分析套种豆科牧草果园生产力的变化。结果显示,白花扁豆套种1年,测产3次,年均鲜草产量为24 555.6 kg/hm^2,干草产量为5 217.75 kg/hm^2,鲜干比为4.71∶1;白花扁豆区芒果总酸、总糖相对于空白区分别降低50%和7.19%,可溶性固形物提高2.70%;白花扁豆区10~20cm深度土壤相对于空白区全效氮、全效磷、全效钾、速效磷、有机质分别提高9.89%,66.7%,10.2%,69.05%,24.1%,速效氮、速效钾、pH值分别降低0.55%,11%,4.3%,全效磷、速效磷、有机质等含量变化差异显著(p<0.05)。

Aimed to the condition that there exit lots of mountains but less field in Guangxi and the field under most fruit trees is free, the research interplanted high-quality leguminous forage with mango trees, the area of which is designed to be 90 m^2, with the neighbouring free field of the same size as contrast and further measuring the production of forage grass, nutrients of fruits, the soil nutrients, analyzing the change in fruit production after interplanting. During the period of interplanting measuring the production thrice, the production of fresh grass in a year reach 24 555.6 kg/hm^2 while thar of the dry being 5 217.75 kg/hm^2 with the ratio being 4.71 ： 1. Compared with the contrast, the total acid and total sugar of fruits from trees interplanted with grass decrease by 50%, 7.19% while the soluble solid increase by 2.70% and the total nitrogen, the total phosphorus, the total potassium, the available phosphorus and the organic matter of soil in the depth of 10-20 cm increase by 9.89%, 66.7%, 10.2%, 69.05%, 24.1% while the available nitrogen, the available potassium and pH decrease by 0.55%, 11%, 4.3% respectively, the difference being significant （p〈0.05） .