包膜尿素不同配比减施对土壤无机氮含量及玉米氮素吸收的影响
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Effects of Soil Inorganic Nitrogen and Nitrogen Absorbing by Maize Under the Reduced Application of Coated Urea at Different Proportions
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图4. 玉米各生育时期0—100 cm土层中无机氮的变化 |
Fig. 4. Changes of inorganic nitrogen in 0-100 cm soil layer at different growth stages of maize |
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