介绍了YN型土壤肥料养分测定仪的结构及工作原理。
The paper gives a detailed introduction to the structure and working principle of YN type speediness soil and fertilizer nutrient measuring apparatus.
但生产内容单调，多数为纯粮型种植结构，经济效益不高，不利丰富社会产品和改善土壤物理性状。
But the low benefit of mono - cereal cropping structure is their main weak point which are unfavourable for providing plentiful agricultural products and improving the physical character of soil.
但生产内容单调，多数为纯粮型种植结构，经济效益不高，不利丰富社会产品和改善土壤物理性状。
But the low benefit of mono - cereal cropping structure is their main weak point which are unfavourable for providing plentiful agricultural products and improving the physical character of soil.
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