| Characteristics of soil nutrients and present situation of fertilization in the major wolfberry producing areas of Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2016.02.18 |
| Key Words: wolfberry present situation of fertilization soil nutrients soil NO3--N accumulation |
| Author Name | Affiliation | | LI Yun-xiang | Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | WANG Shao-dong | Bureau of Wolfberry Industry Development and Service of Zhongning County, Zhongning, Ningxia 755100, China | | KE Ying | Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | LUO Jian-hang | Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | CHEN Xiao-qun | Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China | | ZHANG Xue-jun | Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, Ningxia 750002, China |
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| Abstract: |
| In order to figure out the present situation of fertilization and soil nutrient abundance/deficiency in major wolfberry producing areas in Ningxia, the method with household sampling surveys was conducted to investigate fertilizer types and application rates with different tree-age wolfberries in Zhongning (n=112) and Huinong (n=20) of Ningxia. In addition, through soil sampling and examination at 48 and 18 monitoring points, respectively, the present situation of soil nutrients content was evaluated. The results indicated that fertilization organic and inorganic fertilizers were applied on wolfberry in Zhongning, while chemical fertilizer was primarily used in Huinong. The main fertilizers in both areas included urea, diammonium, and compound fertilizer (the input ratios accounted for 88.9%～100.0% of the total farmers). N, P2O5, and K2O input rates for different tree-age wolfberries were 716～909, 654～1043, and 149～194 kg·hm-2 in Zhongning, and were 549～552, 276～285, and 69～74 kg·hm-2 in Huinong, respectively. Small differences were observed in 0～30 cm soil organic matter, total N and available K contents between Zhongning and Huinong wolfberry fields. However, soil available P content (135.7 mg·kg-1) in Zhongning was significantly higher than that in Huinong (49.3 mg·kg-1). Nitrate was the main available N residue left in soils of both areas, increased with the aging of wolfberry. Soil available P in 6～10 and ≥10 years wolfberry fields in Zhongning was 3.3 and 2.5 times than that in ≤5 years wolfberry fields, but there was not much difference between the two areas. Therefore, it is advised that combined application of organic-inorganic fertilizers may need to be followed, and based on ages of wolfberry and objective yields, control in total application rates of nitrogenous and phosphate fertilizers, and properly increased application of potassium fertilizer may also need to be considered. |
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