| Maize is both an important food crop and an indispensable feed.Together with wheat and rice,corn is known as the “three major cereals” in global food production and trade.It is also an important food crop in the world today.It occupies an important position in the food system of our country and the world.Heilongjiang Province is a major corn producing area in northeast China.It is also an important commodity grain production base.Its corn production accounts for a considerable proportion of the country’s grain production.The per capita possession of corn and the commodification rate are ranked in the country.It is also among the best.Lanxi County in Suihua City is located in the south-central part of Heilongjiang Province.It is a semi-humid monsoon climate with cold temperate zone.The planting area of the province is about 90 million mu,ranking first in the country,while the total corn output in the province is around 36 million tons.Ranked fourth in the country,second only to Shandong,Jilin and Henan,so the corn production in Heilongjiang Province is the cornerstone to ensure the rapid development of China’s national economy.This paper studies the optimum fertilization ratio of nitrogen,phosphorus and potassium in corn field in Lanxi County,Suihua City,Heilongjiang Province.Lanxi County,Suihua City is located in the south-central part of Heilongjiang Province.It is a semi-humid monsoon climate with cold temperate zone and is the first and second temperate zone of Heilongjiang Province.Corn is grown in large counties,but farmers generally use traditional planting methods,which are relatively backward and have low economic yield.This paper improves the yield and quality of corn planting in Heilongjiang Province through fertilization techniques,and produces corn in Heilongjiang Province,especially in Lanxi County,Suihua City.Decision making provides important reference data.The main findings are as follows:1 During the growth period of maize,when the corn grew to the 10 leaf stage,the SPAD value and chlorophyll content in the corn leaves reached the maximum,and the SPAD value and the chlorophyll content were significantly positively correlated.2 The effect of nitrogen fertilizer on nitrogen uptake by maize is a curve that promotes and then inhibits.Phosphate fertilizer also promotes the absorption and accumulation of nitrogen in corn.Phosphate fertilizer is the only decisive factor for the accumulation of phosphorus in corn during corn growth and development.The combination of nitrogen fertilizer and phosphate fertilizer will obviously promote the absorption and accumulation of potassium in corn.3 The content of reducing sugar in corn is closely related to the application rate of nitrogen fertilizer.The effect of phosphate fertilizer is very small.Nitrogen is the main factor affecting the content of corn starch.The application of nitrogen fertilizer is the main factor affecting the crude protein content of corn.The effect of phosphate fertilizer is second..4 The application of nitrogen fertilizer and phosphate fertilizer can increase the yield of corn,and the application of potassium fertilizer will increase the yield of corn to some extent,but excessive application of potassium fertilizer will reduce the yield of corn.Corn is most sensitive to nitrogen,followed by phosphorus and potassium.5 The utilization rate of nitrogen and potassium fertilizers is low,and the utilization rate of phosphate fertilizer is moderate.6 According to the results of this test,only the yield difference is significant,so T7 treatment is the best fertilizer amount in the treatment.7 The calculated results show that the optimum fertilization amount of nitrogen is 348.76 kg ha-1,the optimum fertilization amount of phosphorus is 235.56 kg ha-1,and the optimum fertilization amount of potassium is 40.41 kg ha-1.According to this ratio,a small range of suitable species can be carried out and research can be continued. |
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