云南橡胶园土壤存在明显酸化、有机质下降、有效养分降低、缺素和营养失调等问题。
Soil acidization, low organic substance and effective nutrients, nutrition defect and disorder are the major problems in rubber plantations of Yunnan.
请简要说明营养液栽培与土壤栽培在植物养分供应上的不同点。
Please show the brief differentia between hydroponics and soil culture.
对农作物、化肥和我国土壤营养特性作了简要描述，并对全国和几个典型地区的农田养分平衡作了估算。
The nutritive peculiarities of crops, fertilizer and soils are described. Meanwhile the nutrient balances of farmland in several typical areas of China are also estimated.
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