| Effects of combined application of organic and chemical fertilizers on the yield and water utilization of spring maize in dryland |
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| DOI：10.7606/j.issn.1000-7601.2012.06.24 |
| Key Words: organic and chemical fertilizers spring maize summer drought yield water use efficiency(WUE) |
| Author Name | Affiliation | | CHEN Gang | College of Agronomy and Biotechnology, China Agricultural Unitersity, Beijing 100193, China | | WANG Pu | College of Agronomy and Biotechnology, China Agricultural Unitersity, Beijing 100193, China | | TAO Hongbin | College of Agronomy and Biotechnology, China Agricultural Unitersity, Beijing 100193, China | | ZHANG Zhongdong | Maize Research Instiute, Shanxi Academy of Agriculture Sciences, Xinzhou 034000, China |
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| Abstract: |
| Field experiment was settled to study effects of combined application of organic and ehemical fertilizers on the yield and water utilization of spring maize during summer drought in dryland. The results showed that the yields were more significantly increased from 1.49 t/hm2 to 2.63 t/hm2 with the fertilizers application than the treatment without applying any fertilizer(CK), the WUE(water use efficiency)were from 41.3% to 72.3% and the PUE(precipitation use efficiency)were from 45.7% to 80.7%. Furthermore, the yield(5.89 t/hm2), WUE〔13.15 kg(hm2·mm)〕and PUE〔14.39kg/(hm2·mm)〕were the highest with the combined application of organic and chemical fertilizers. The soil bulk density in 0∽40 cm soil depth decreased significantly with the organic fertilization while the soil total porosity increased. Hence, organic fertilizer effectively enhanced the capacity of water retention in the depth of 0∽40 cm soil layer. ln the early period of summer drought, the soil moisture in the depth of 0~60 cm was improved with the fertilizer application, especially the combined application of organic and chemical fertilizers because the normal precipitation and soil storage. Meanwhile, the soil moisture in the depth of 60 200 cm soil layer did not change obviously. The soil mois-ture of 0 200 cm soil layer decreased constantly with the summer drought intensifying and the surface soil moisture were similar among treatments. While the soil moisture in deep soil depth(40~200 cm) of the fertilizer treatments decreased much more than CK because of faster growing and more water consumption. |
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