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一、引言确定适宜的利用期是草地生产的重要课题之一。由于牧草生物量和营养物质形成不同步,随着植物的生长和生物量的增加,植株体内粗蛋白质等营养物质含量逐渐降低,粗纤维含量逐渐增高,牧草品质下降。因而通常以最高生物量或营养物质含量动态确定刈割时期,难以同时兼顾数量和质量。利用期不当,造成养分和能量损失。如何将产量和质量结合,确定适宜的利用期以取得最大经济效益,目前仍没有满意的方法。本文以优良牧草沙打旺(Astragalus adsurgens Pall.)
I. Introduction It is one of the important topics for grassland production to determine the appropriate period of utilization. As the herbage biomass and nutrient formation are not synchronized, with the growth of plants and biomass, plant crude protein and other nutrients gradually decreased, the crude fiber content gradually increased, the quality of forage declined. Therefore, the mowing period is usually determined dynamically with the highest biomass or nutrient content, making it difficult to balance both quantity and quality. Uses of improper use, resulting in nutrient and energy losses. How to combine the output and quality, to determine the appropriate period of use to obtain maximum economic efficiency, there is still no satisfactory method. In this paper, Astragalus adsurgens Pall.