| Rates of water and fertilizer on their use efficiency and seed vigor of seed maize |
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| DOI：10.7606/j.issn.1000-7601.2021.01.17 |
| Key Words: irrigation quota N application P application coupling effects of water and fertilizer seed vigor yield seed maize ridge mulching\|furrow irrigation |
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| Abstract: |
| To propose the optimal coupling model of water and fertilizer, the coupling effect of water and fertilizer on the yield and seed vigor of seed maize under ridge mulching\|furrow irrigation pattern were examined by a located field trial in Zhangye Water\|saving Agriculture Station from 2016 to 2017. The experiment adopted 3414 design with the three factors were water, nitrogen (N) and phosphorus (P). The results showed that the yield of seed maize varied greatly under different irrigation and N levels, the yield of W2N2P2, W2N3P2, and W2N2P0 treatments were significantly higher than that of CK (W0N0P0) treatment. These treatments increased the yield by 36.0%, 27.9% and 30.6%, respectively, and the average WUE enhanced by 29.3%, and N utilization efficiency enhanced by 20.75%~28.59%, and P utilization efficiency increased by 11.49%~13.23%. Under the same irrigation rate, the germination index and rate increased with increasing N application rates, and there was no significant difference between treatments. However, the vigor index increased first and then decreased with increasing N application. Under the same N amount, the germination index, germination rate, and vigor index increased first and then decreased with increasing irrigation rates. The seeds vigor was the highest with medium irrigation amount (480 mm) and medium N rate (240 kg·hm-2). By analyzing comprehensive seed vitality index, the seeds vigor of W2N2P2 and W2N2P0 treatments was significantly higher than that of W0N0P0 and W0N2P2, and the vigor indexes were enhanced by 0.41 and 0.40% than that of CK (W0N0P0) treatment. In conclusion, the optimal irrigation quotas was 375~480 mm, the optimal N application rate was 210~240 kg·hm-2 and the optimal P application rate 120~150 kg·hm-2. |
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