| Effects of controlled-release compounded fertilizer on potato yield, soil nitrate-N content and nitrogen use efficiency |
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| DOI：10.7606/j.issn.1000-7601.2018.05.19 |
| Key Words: controlled-release compounded fertilizer potato yield nitrate-N content NUE |
| Author Name | Affiliation | | ZHANG Yang | Academy of Agricultural and Forestry, Qinghai University, Xining, Qinghai 810016, China | | SHENG Hai-yan | College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai 810013, China | | ZHANG Rong | Academy of Agricultural and Forestry, Qinghai University, Xining, Qinghai 810016, China | | XU Ting-ting | Academy of Agricultural and Forestry, Qinghai University, Xining, Qinghai 810016, China | | NIAN Guang-lan | Agricultural Technology Promotion Center of Huang Zhong County, Xining, Qinghai 810019, China | | TIAN Feng | College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai 810013, China | | WANG Chun-yu | College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai 810013, China | | LI Song-ling | Academy of Agricultural and Forestry, Qinghai University, Xining, Qinghai 810016, China |
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| Abstract: |
| To explore a new way for development potato in arid hill drought regions of Qinghai Province, a field experiment was conducted to assess the effects of controlled-release compounded fertilizer on potato yield, soil nitrate-N content, soil nitrate-N accumulation and nitrogen use efficiency under plastic film mulching condition. The results showed that the highest potato yield was 47 240 kg·hm-2 in 1 050 kg·hm-2 controlled-release compounded fertilizer (RZ70) treatment. Comparing to farmer’s conventional fertilization (NXG) treatment, the potato yield of RZ70 was increased 2 175 kg·hm-2,and the increasing rate was 4.83%. Comparing to special potato fertilizer (MZY) treatment, the potato yield was increased 5 085 kg·hm-2, and the increasing rate was 12.06%. From seedling to mature stage of potato, soil nitrate-N content in depth of 0~100 cm increased significantly under farmer’s conventional fertilization (NXG) treatment and special potato fertilizer(MZY) treatment, whereas, soil nitrate-N content in depth of 0~100 cm decreased significantly under 1 050 kg·hm-2 controlled-release compounded fertilizer (RZ70) treatment. Soil nitrate-N content in depth of 0~100 cm trended as increasing first，then decreasing in the growing season. Nitrate-N content presented a peak in the resettling stage, and mainly concentrated in depth of 20~40 cm. With the growth and development of potato, the difference of soil nitrate-N content in depth of 0~100 cm gradually reduced and stabilized to a minimum level in mature stage. Soil nitrate-N accumulation in depth of 0~100 cm showed a decreasing trend in the growing season under farmer conventional fertilization (NXG) treatment. The changes of soil nitrate-N accumulation in depth of 0~100 cm was similar to soil nitrate-N content, except in farmer conventional fertilization (NXG) treatment. The highest nitrogen use efficiency was 53.70% in 1 050 kg·hm-2 controlled-release compounded fertilizer (RZ70) treatment. It increased 3.38%~40.85% and 5.01%~33.25% respectively, comparing to farmer conventional fertilization (NXG) and special potato fertilizer (MZY) treatment. The findings provide a theoretical basis for rational application of controlled-release compounded fertilizer in potato planting of Qinghai province. |
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