| Effects of straw returning on soil water, biological traits and yield of maize in the eastern arid region of Gansu |
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| DOI：10.7606/j.issn.1000-7601.2016.05.11 |
| Key Words: straw returning soil moisture corn biological traits arid region in eastern Gansu |
| Author Name | Affiliation | | GAO Fei | Agricultural Water-saving and Soil fertility Management Station of Gansu, Lanzhou, Gansu 730020, China | | CUI Zeng-tuan | Agricultural Water-saving and Soil fertility Management Station of Gansu, Lanzhou, Gansu 730020, China | | SUN Shu-mei | Agricultural Water-saving and Soil fertility Management Station of Gansu, Lanzhou, Gansu 730020, China | | GUO Shi-qian | Agricultural Water-saving and Soil fertility Management Station of Gansu, Lanzhou, Gansu 730020, China | | FU Qin-min | Agricultural Water-saving and Soil fertility Management Station of Gansu, Lanzhou, Gansu 730020, China |
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| Abstract: |
| To investigate the effects of different straw returning treatments on the yield, soil water, and growth characteristics of corn during key growth period, a field experiment was conducted in the area of eastern Gansu province. The experiment of corn straw returning was implemented by three levels including 10 500 kg·hm-2(G), 7 875 kg·hm-2(Z), and 5 250 kg·hm-2(D). The control treatment had no straw returning. Each treatment contained three replicates. With a completely randomized block arrangement, straw was chopped at the length about 5 cm and was uniformly buried in the 25 cm soil layer. The results showed that compared with the control treatment, the average soil moisture in the 0～200 cm soil layer was significantly increased by 2.0%, 2.8% and 1.9% by G, Z and D treatments, respectively. The differences were not significant between different straw returning treatments. Compared with CK, maize height, stem diameter and leaf area had been significantly increased (P<0.05) by 100% to 50%. Also, grain yield of corn was increased by 10.3%, 5.7% and 3.7%, respectively; WUE of corn was increased by 9.2％, 4.9％ and 3.1％, respectively. The results indicated that straw returning treatments in the area of eastern Gansu province can increase WUE, ability of soil water storage and soil microbial content, improving soil physical and chemical properties and thereby increasing the yield of corn. |
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