养分有效性 meaning in Chinese

nutrient availaility

Because of alkaline calcareous nature of soils , availability of micronutrient is a problem , particularly zn in rice soils , cu and zn in citrus and fe in apples
因碱性石灰性土壤的特性，微量养分有效性不高，特别是水稻土中缺锌，柑桔园中缺铜缺锌和苹果园中缺铁。
In view of improving the efficiency of fertilizer , we paid more attention to the effect of water dynamic process and strength on nutrient availability . in this research , by model test , four kinds of agricultural soils were studied , concerning about the effect of drying - wetting alternation and temperature on potassium availability , ions " diffusion in soils under different levels of water content , and the distribution coefficient of potassium between solution and soil phases
因此，本研究通过室内模拟土壤水分的动态变化，对水分变化的过程(干湿交替不断进行)和变化强度对养分有效性的影响，不同水势状态下养分离子在固、液相间的分配关系，以及不同水分条件下养分的扩散迁移规律等方面进行了探讨。