| Effects of bulk blend fertilizers with different controlled nitrogen ratios on the soil inorganic nitrogen, urease and winter wheat yield |
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| DOI：10.7606/j.issn.1000-7601.2016.04.24 |
| Key Words: winter wheat bulk blending nitrogen fertilizer inorganic nitrogen urea yield |
| Author Name | Affiliation | | ZHANG Jing-sheng | College of Resources, Sichuan Agriculture University, Chengdu, Sichuan 611130, China | | LI Bing | College of Resources, Sichuan Agriculture University, Chengdu, Sichuan 611130, China | | WANG Chang-quan | College of Resources, Sichuan Agriculture University, Chengdu, Sichuan 611130, China | | YIN Bin | Institute of soil science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China | | XIANG Hao | College of Resources, Sichuan Agriculture University, Chengdu, Sichuan 611130, China | | FU Yue-jun | College of Resources, Sichuan Agriculture University, Chengdu, Sichuan 611130, China | | XIE Yi-ping | College of Resources, Sichuan Agriculture University, Chengdu, Sichuan 611130, China |
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| Abstract: |
| To reveal the effect of different application of controlled release nitrogen fertilizer combined with urea on the soil inorganic nitrogen, urease and winter wheat yield, we carried out the field experiment aimed at studying the optimum combination of controlled release nitrogen fertilizer and conventional urea and thereby putting forward proposal for reducing nitrogen fertilizer loss and non-point source pollution, and saving cost as well. The results showed that compared with urea, combination application of controlled release nitrogen fertilizer and urea treatment had less influence on soil NH+4-N contents. At wheat tillering stage, urea treated soil NO-3-N contents and urease were more active. By contrast, soil NO-3-N contents and urease activity were higher by combination of urea and 40% controlled release nitrogen fertilizer at the later growth stage. Nitrogen fertilizer treatments had a little influence on the grain number per panicle and the 1000-weight of wheat. While 60% urea blended with 40% controlled release nitrogen fertilizer (40%CRU) increased grain yield significantly, as high as 14% compared with urea treatment. As the output value was the highest, input cost was moderate, the net income level and output/input ratio were the highest, respectively, 5 875.72 yuan·hm-2 and 2.24, compared with the urea treatment increased by 23.24% and 9.27%. In conclusion, the combined application of 40% controlled release nitrogen fertilizer with 60% conventional urea was the optimum ratio with the beneficial effect of improving soil inorganic nitrogen contents, activating the urease activity during the later growth stage of wheat, and increasing the yield of winter wheat. |
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