| Model of fertilization on jujube under dry farming condition in mountainous region of Loess Hilly in North Shaanxi |
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| DOI：10.7606/j.issn.1000-7601.2016.05.28 |
| Key Words: dry farming Jujube fertilization model Jujube quality |
| Author Name | Affiliation | | SHU Zhou | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | XU Fu-li | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
ISWC, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | WANG Wei-ling | College of Economics and Management, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Yun | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Upon the employment of a three-factor and D-optimum repercussion layout for the use of N, P and K fertilizers, a field experiment was carried out to explore the optimal rates of fertilizer application and the responding models for mountain jujube under the condition of straw mulching to the fertilizers in the loess plateau in north Shaanxi province. The results showed that the combined effects of NPK fertilizers on jujube yield followed the order of K>N>P fertilizers. Through the field experiment, the responding models of mountain jujube under the condition of straw mulching to N,P and K fertilizers were found out and the effects of N , P and K fertilizers on mountain jujube under the condition of straw mulching were explored. Based on the responding models of yields to N, P and K fertilizers, an optimized fertilization plan on N, P and K fertilizers was put forward for a high target yield of 18 000～25 000 kg·hm-2, specific as the follows: N fertilizer rate of 267.8～518.6 kg·hm-2, P2O5 fertilizer rate of 83.7～360.0 kg·hm-2, and K2O fertilizer rate of 438.0～491.0 kg·hm-2. NPK fertilizer treatments had increased the contents of titratable acid, total sugar, reducing sugar, and soluble solids by 32.5%, 0.82%, 1.8%, and 1.01%, relatively from no fertilization treatments. But NPK fertilizer treatments relatively decreased date flavonoid content by 40.4% from no fertilizer treatments. In conclusion, NPK fertilizers resulted in better quality jujube than no fertilizers. |
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