| Application of DRIS in foliar nutrition diagnosis of Fuji apple trees in Weibei dryland of Shaanxi province |
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| DOI：10.7606/j.issn.1000-7601.2013.02.16 |
| Key Words: Fuji apple nutrition diagnosis diagnosis and recommendation integrated system (DRIS) DRIS parameters |
| Author Name | Affiliation | | MA Haiyang | College of Resources and Environmental Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China | | TONG Yanan | College of Resources and Environmental Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China | | LU Yongli | College of Resources and Environmental Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China | | GAO Yimin | College of Resources and Environmental Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China | | CHEN Liling | College of Resources and Environmental Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China | | WANG Shaojie | College of Resources and Environmental Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The diagnosis and recommendation integrated system (DRIS) method was adopted in foliar nutrition diagnosis to provide the basis for rational fertilization of Fuji apple trees in Weibei dryland. The results sho
wed that the optimum concentrations of N, P, K, Ca, Mg, Cu, Fe, Mn and Zn in leav
es of apple trees were 26.04±3.50 g·kg-1, 2.84±0.74 g·kg-1, 15.05±4.08 g·kg-1, 14.25±3.04 g·kg-1, 3.15±0.73 g·kg-1,12.69±3.14 mg·kg-1, 262.87±82.05 mg·kg-1, 96.33±33.35 mg·kg-1 and 23.57±10.13 mg·kg-1, respectively. Except for N/Zn, Cu/P, P/Zn, Ca/Zn, Mg/Zn and Cu/Zn, the coefficients of variation of the low-yield group (<25 kg·tree-1) were wholly larger than those of the high-yield group (>25 kg·tree-1) for the obtained 30 parameters. The nutrient imbalance index (NII) was 73 in the high-yield group and 88 in the low-yield group. The mineral nutrients were more unbalanced in the low-yield group compared with the high-yield group. In general, for most Fuji apple orchards in the Weibei dryland, the requirement of P was ranked in the first place among all fertilizers, while for those with a yield above 41.3 kg·tree-1, the requirement of Cu was ranked in the first place; the second element was K for the high-yield orchards and the orchards whose yield was lower than 10.2 kg·tree-1, but it was Zn for other orchards; and the third element was Ca and Mg for the high-yield and low-yield orchards, respectively. |
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