| Effects of nitrogen rate on the growth of winter wheat under long-term straw mulching |
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| DOI：10.7606/j.issn.1000-7601.2016.04.20 |
| Key Words: straw mulch winter wheat N rate population dynamics grain yield |
| Author Name | Affiliation | | WANG Ren-jie | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | LU Jun-jun | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | LIU Wei | Soil-Fertilizer Station, Agricultural Bureau of Baoji, Baoji, Shaanxi 721000, China | | YANG Jun-lin | Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | ZHANG Yue-xia | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | DONG Ming-lei | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | LI Wen-long | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHAI Bing-nian | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | GAO Ya-jun | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China |
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| Abstract: |
| A 9-year-long field experiment from 2004—2013 was carried out to investigate the effects of straw mulch (no mulch and straw mulch 4 500 kg·hm-2) and N rate (0, 75, 150, 225 and 300 kg·hm-2) on population dynamics, yield components and grain yield of winter wheat. The results showed that straw mulch significantly reduced overwintering tillers and total stem number in spring. Overwintering tillers and total stem number in spring under straw mulch reduced 24% and 40.7% compared with no mulch respectively. Straw mulch led to slight decrease (5.6%) of ears per hectare and slight increase of grain number per spike. 1000 grain weight had no significant change with straw mulch. A declining trend of wheat yield for straw mulch treatments was found compared to no mulch treatments. Regardless of no mulch or straw mulch, the relationships between overwintering tillers, total stem number in spring, ears per hectare and nitrogen fertilizer rate could be described by parabolicfunction. Grain number per spike increased while 1000 grain weight decreased with the increase of nitrogen rate. Application of nitrogen fertilizer almost increased grain yield by 70% compared to no nitrogen fertilizer input. No mulch treatments had higher wheat yield with less nitrogen fertilizer than straw mulch treatments. Straw mulch is not a good choice for improving winter wheat growth in this area. |
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