| Effects of combined application of organic and chemical fertilizers on nutrient uptake and utilization of maize in newly reclaimed saline soil |
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| DOI：10.7606/j.issn.1000-7601.2013.05.029 |
| Key Words: irrigation area of Yellow River newly reclaimed saline soil combined application of organic and chemical fertilizers nutrient uptake nitrogen use efficiency |
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| Abstract: |
| A field experiment was carried out to study the effects of combined fertilization on yield as well as nutrient uptake and utilization of maize in newly reclaimed saline land in the high lift irrigation area of Yellow River in Gansu Province. The results showed that fertilization could significantly increase the grain yield of maize by 13.4% to 168.8%. Excessive application of nitrogen fertilizer
could injure the leaves and thus affect the straw yield. The effects of organic manure were very outstanding under the combined fertilization condition, no matter with middle nitrogen (300 kg·hm-2) or high nitrogen (600 kg·hm-2). Both the nutrient contents and uptakes in maize plants were improved significantly with the increase of fertilization rate. Grain was the main organ for nitrogen and phosphorus absorption, but straw was that for potassium absorption. Combined application of organic and inorganic fertilizers could promote the absorption of N, P and K in maize. Under different treatments, the nitrogen utilization ratio was 14.47% to 20.74%, the partial factor productivity from applied N was 11.06 to 25.69 kg·kg-1, the agronomic efficiency of applied N was 3.04 to 11.40 kg·kg-1, and the physiological efficiency of applied N was 20.08 to 56.63 kg·kg-1, being relatively low as a whole because of the lower utilization of organic manure and the little contribution of organic manure to total nitrogen s
upply in the current year. |
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