| Effects of different patterns of planting and fertilization on the residual of spring maize soil nitrate nitrogen in dry-land |
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| DOI：10.7606/j.issn.1000-7601.2018.05.17 |
| Key Words: double ridge mulching and furrow planting optimize fertilization dry-land spring maize nitrate nitrogen residual |
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| Abstract: |
| Film mulching technology is widely promoted in dry-land. To find out the scientific and reasonable fertilization level in the film mulching mode，and try to reduce the soil nitrogen residue and leaching，a field experiment was conducted．In this experiment，3 planting pattern treatments：double ridge mulching and furrow planting(F)，half covered and flat planting (H) and open and flat planting(O) were established with 3 fertilization levels,,optimized fertilization (OPT)，farmers’ conventional fertilization(FP) and no fertilization(CK)．Soil nitrogen at different growth stages of spring maize was measured., The residual nitrate content,,its distribution and dynamics of soil in different treatments were analyzed.The results showed that NO-3-N accumulation in the soil increased with the amount of nitrogen fertilizer and the residual amount of NO-3-N in depth of 0~200 cm could be as high as 428.3 kg·hm-2．The average accumulation of NO-3-N in OPT and FP treatment was 7.6 and 4.4 times higher than that in CK respectively．Film mulching could reduce nitrogen’ residue，especially in F treatment．In the long-term nitrogen’ fertilization，NO-3-N residues were prone to occur in O treatment，which mainly distributed in depth of 60~140 cm and near the depth of 100 cm was the highest.With the advance of maize growth period, the content of NO-3-N in depth of 0~200 cm decreased gradually in the F and H treatments.The residual nitrate content of soil was kept on a low level at the time of harvest，while the O treatment on a high level．Therefore, OPT with F could improve the nitrogen efficiency use, reduce the leaching of soil nitrate nitrogen as well as the accumulation of NO-3-N caused by high nitrogen application． |
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