The effect of Melilotus officinalia on improving degraded soil is studied according to the change in nutrient content of soil after planting.
通过对人工种植黄花草木樨样地的监测，根据土壤养分含量的变化研究了改良退化土壤的效果。
Myricaria laxiflora, on the other hand, prefers the alluvial soil with sand and gravel in subtropics climate. The soil is of weak alkalinity, has low content of nutrient but moderate salt.
疏花水柏枝适宜于亚热带气候下弱碱性、养分含量低的冲积性砂砾质初育土，能耐一定程度的盐分。
The research content included the slope-directive variation of soil bio-accumulations properties and related nutrient status, base cation leaching, the quantity of microorganism etc.
研究内容主要包括土壤生物积累及相关养分状况、盐基淋溶作用和微生物数量等方面的坡向性分异，并探讨其对山地土壤资源开发利用和生态环境建设的意义。
The content of quick effective nutrient of soil is formed by applying fertilizer for years.
土壤速效养分含量是多年培肥土壤形成的，不属当年施肥。
Studies have shown that the soil nutrient loss has strong connection with its content, and the accumulation of soil nutrient can increase the loss potential.
农业面源污染物质氮、磷流失是与土壤营养物含量之间存在较强的联系，土壤营养物的累积可增大流失风险。
The composition of exchangeable cation and the soil nutrient content can be used as the indexes to evaluate soil chemical fertility evolution, especially the former is more important.
交换性阳离子组成、养分全量及速效含量可作为评价红粘土红壤化学肥力演化的指标。
Weeping Alkaligrass with high nutrient value can decrease the salt content of salinized soil surface.
碱茅草能降低盐渍化土壤表层的含盐量，营养价值高。
Study on the Interrelationship among Nutrient Content of the Steppe Soil and Meteorological Factors.
草原土壤养分含量与气象因子相互关系的研究。
The effects of six organic manures on nitrate content and nutrient quality of foliage vegetables (celery and romaine lettuce) were studied in soil-less culture.
采用基质栽培试验研究了不同有机肥种类对叶类蔬菜（芹菜和生菜）硝酸盐和营养品质的效应。
Soil nutrients abruptly loss in the beginning stage of forest removal. After five years of forest removal, soil nutrient content reduces by 50%.
土壤养分流失在开垦初期非常迅速，开垦耕种5 a后，土壤养分含量可减少5 0 %。
Soil nutrients abruptly loss in the beginning stage of forest removal. After five years of forest removal, soil nutrient content reduces by 50%.
土壤养分流失在开垦初期非常迅速，开垦耕种5 a后，土壤养分含量可减少5 0 %。
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