2012•Unpublished venueRequires access
Effect of various levels of NPK on corn yield and fertilizer use efficiency in middle yield field of alluvial soil.
Jia Gai-hua, Xu JinTang
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Abstract
A field experiment was conducted to check the corn yield and fertilizer use efficiency in the middle yield field of alluvial soil in Tangyin county.The results showed that the corn yield increased with the amount of nitrogen used,but corn yield decreased with the amount of nitrogen applied over 210 kg/ha.The highest nitrogen agronomic efficiency(20.5 kg/kg) was obtained in the treatment of 210 kg/ha.The corn yield and phosphate agronomic efficiency also increased with the amount of phosphate fertilizer used within 0-112.5 kg/ha,and reached the highest with the amount of 75 kg/ha,in which corn yield was 20.8% higher than the treatment of no phosphorus,with 20.2 kg/kg for phosphorus agronomic efficiency,while corn yield and P agronomic efficiency decreased with the amount of P applied over 75 kg/ha.The corn yield increased with the amount of potassium fertilizer used within 0-112.5 kg,but the opposite trend was observed for potassium agronomic efficiency.Therefore,N210P75K37.5 was recommended as optimal ratio of NPK for corn higher yield and higher efficiency in middle yield field of Tangyin county.