An Integrated Study On The Annual High-yielding Cultivation Of Wheat And Corn Rotation

The effects of nitrogen, phosphorus, potassium, wheat straw and population(seed quantity of wheat,planting density of corn) on the yield, net output value, grain protein content, biological characters, annual yield, annual net output value and fertility of soil in winter wheat and corn were studied with the orthogonal design,The results indicated as follow:1.Effects of tested factors on the yield, net output value, grain protein content in winter wheat. The sequence of the contribution to the yield was N>seed quantity>K₂O>P₂O₅>wheat straw; to the net output value was seed quantity>N>K₂O>P₂O₅>wheat straw; to grain protein content was P₂O₅>N>seed quantity>wheat straw>K₂O.2.Effects of tested factors on the yield, net output value, grain protein content in corn. The sequence of the contribution to the yield was N>planting density>K₂O>wheat straw>P₂O₅; to the net output value was planting density> N>K₂O>P₂O₅>wheat straw; to the grain protein content in corn was N>planting density>K₂O>wheat straw>P₂O₅.3. Effects of tested factors on the annual yield, annual net output value. The sequence of contribution to the annual yield was N>K₂O>P₂O₅>population>wheat straw, so did annual net output value.4.Effects of tested factors on the soil fertility. Nitrogen could increase not only the content of alkaline hydrolysis nitrogen but also the organic content. Phosphoric fertilizer could obviously increase the content of validity phosphorus. The contribution of the potassium fertilizer and wheat straw to the content of rapidly available potassium in the soil was at the most. Population had significant effect on the content of alkaline hydrolysis nitrogen in the soil. None of the tested factors had significant effect on the content of organic matter.5.Effects of tested factors on the grain protein content in winter wheat and corn. The factors showed different, but not significant, effect on the grain protein content in winter wheat and corn.6.The best combinations of tested factors for the annual high-yielding cultivation of winter wheat and corn ration. The best combination for winter wheat was N₄P₂K₂S₄P₁ (the application rates of nitrogen fertilizer was 315 kg/hm², P₂O₅ was 37.5 kg/hm², K₂O was 45 kg/hm², wheat straw was 6750 kg/hm², seed quantity was 105 kg/hm²,the variety was Yannong 25). The best combination for corn was N₄P₂K₄S₄P₄ (the application rates of nitrogen fertilizer was 315kg/hm²,P₂O₅ was 37.5kg/hm², K₂O was 135kg/hm²,wheat straw was 6750kg/hm²,planting density was 67500 plants/hm²,the variety was Jinhai 5)。...