| Formula screening of multi-functional fertilizer for potato and effects on soil physical & chemical properties |
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| DOI：10.7606/j.issn.1000-7601.2014.03.021 |
| Key Words: multi-functional fertilizer formula screening potato soil properties economic benefit |
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| Abstract: |
| We studied the formula screening of multi-functional fertilizer and relationship between soil physical & chemical properties and economic benefits of potato by using the field experiment method in the Hexi Corridor cultivated chestnut soil of Gansu Province. The results showed that: The sequences affected potato yield factors from large to small were compound fertilizer ＞ water retaining agent ＞ polyvinyl alcohol ＞ 5046 inocula ＞ furfural residue. The best combination between factors was: 5046 inocula as 101.25 kg·hm-2; compound fertilizer as 1500 kg·hm-2; water retaining agent as 22.50 k·hm-2; polyvinyl alcohol as 67.5 kg·hm-2; furfural residue as 11.25 kg·hm-2. There was a positive correlation between the quantity of multi-functional fertilization and soil porosity, aggregate structure, water content, available N, available P, available K, micro organism number, botanical traits of potato, economic characters and yield, and a negative correlation with bulk density and pH value. With the increase of multi-functional fertilizer, the potato yield and contribution rate of fertilizer were added, but the marginal output and marginal profit were decreased. On the basis of 1.40 t·hm-2 quantity of multi-functional fertilizer, if increasing the fertilizer again, the marginal profits will be emerged a negative value. According to the regression statistical analysis, the regression equation between potato yield and quantity of multi-function fertilizer was: y=24.79+6.5408x-0.9251x2. The optimal economical benefit of application fertilizer was 1.3999 t·hm-2, in this case the theoretical yield of potato was 35.7602 t·hm-2. Application the multi-functional fertilizerhe in the cultivated chestnut soil, it can effectively improve the physical and chemical characters and biological properties of soil. In addition, the fertilizer profit and potato yield also will be increased. |
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