| Planting pattern and nitrogen rate on farmland microclimate and yield of winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2017.01.03 |
| Key Words: soil temperature air temperature relative humidity soil water content soil evaporation winter wheat yield |
| Author Name | Affiliation | | WANG Xing-ya | College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China
Shandong Agricultural University, Tai'an, Shandong 271018, China | | ZHOU Xun-bo | Agricultural College of Guangxi University, Nanning, Guangxi 530004, China | | ZHONG Wen-wen | Shandong Agricultural University, Tai'an, Shandong 271018, China | | CHEN Yu-hai | Shandong Agricultural University, Tai'an, Shandong 271018, China | | HAN Kun | Shandong Agricultural University, Tai'an, Shandong 271018, China |
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| Abstract: |
| This study aims to study the effects of planting pattern and nitrogen rate on the farmland microclimate, and indentify possible ways to improve the yield of winter wheat. The field experiment was conducted with a randomized complete block design with three replicates. The two planting patterns were: (1) 30 cm uniform row planting pattern (U), and (2) 20 cm+40 cm furrow planting pattern (F). Three nitrogen rate treatments applied as N0 (0 kg·hm-2), N1 (112.5 kg·hm-2), and N2 (225 kg·hm-2) during the whole growth period. Results showed that F decreased the soil temperature (0～15 cm) by 0.4℃ and air temperature (5, 50 cm) by 0.3℃ and 0.5℃ respectively, and increasedthe air humidity by 2.8% and 3.1% respectively, thus reducing the soil evaporation intensity by 9.9%. In the filling stage, Fevidently increased the diurnal photosynthetic active radiation capture ratio by 13.5% in the upper layer. The grain yield of F was significantly higher than that of U under N1 (P<0.05). The farmland microclimate has been improved with the increase of nitrogen rate, but the extent gradually decreased. Under the condition of F, the yield of N1 was significantly higher than that of N0(P<0.05), but with no significant difference between N1 and N2(P>0.05). Therefore, combination of F and 112.5 kg·hm-2 nitrogen rate was the optimum practices for winter wheat production from perspective of grain yield and fertilizer application amount. |
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