| The research on the potential of production plays an important role in improving the yield of maize by revealing the potential of future grain yield and setting the measures to improve crop yield.Soil nutrient and fertilizer utilization are important indicators of nutrient management and recommended fertilization.At present,the research on the amount of soil nutrient is not deep,and the soil nutrient content is still expressed in the non-fertilizer crops at home and abroad.There are few studies on the variation mechanism of fertilizer utilization rate,which limits the nutrient management in depth.In this study,maize was used as the research object,and the data of meteorological and soil nutrient contents of each city in Liaoning Province from 2006 to 2015 were used to analyze the maize production potential by using light and temperature multiplication method.The main research on the climate and soil fertility factors of different regions in Liaoning Province and based on the experimental data of maize "3414" in Liaoning Province from 2006 to 2011,the soil potassium status of maize in Liaoning Province was analyzed by means of fertilizer function.By means of statistical method,The relationship between the amount of soil potassium and the potassium content in the potassium-free zone was revealed by analyzing the correlation between the amount of potassium supplied in the soil and the potassium uptake in the potassium-free zone.The variation of the potash utilization rate The yield and efficiency of maize potash fertilizer in Liaoning Province was analyzed,and the theoretical basis was provided to realize the nutrient management and efficient utilization of maize.The main findings are as follows:(1)The average potential of photosynthetic production in maize is 32073.76kg/ha,the potential of light and temperature is 11721.01kg/ha,the potential of light and warm water is 6991.49kg/ha,the potential of land production is 5655.34kg/ha,the potential of photosynthetic production and the distribution potential of light and temperature have the trend of decreasing from southwest to northeast,and the difference is significant.The main climate limiting factors of maize production potential in the eastern part of Liaoning Province are light and temperature,maize production potential in western Liaoning and southern China is the difference between the regional and the land production potential,but the variation of soil nutrients among the cities is large.(2)The average amount of potassium available for maize in Liaoning Province is 239.7kg/ha,the average potassium uptake in the potassium-free zone is 150.7kg/ha,the average Ks-U0 is 89.0kg/ha,the range is 0.4-233.1kg/ha and the soil potassium utilization rate is 0.7kg/kg.U0 can not fully represent the soil support component,and Ks can better reflect the soil potassium status.(3)The average potash utilization rate of maize in Liaoning Province is 17.45%,and the amount of potassium in soil is the main factor of change of potash utilization rate.The results showed that Kmax/Ks and U0/Ks are the two main ways to change the utilization rate of potassium fertilizer,improve the demand of crop potassium and improve the effective supply of potassium and potassium in soil.The main problems faced by maize production in Liaoning Province were still.(4)The average potassium capacity of maize in Liaoning Province is 0.64kg/kg,and the variation range was 0.48-0.80kg/kg.The average residual amount of soil potassium is 198.80kg/ha,among which the average potassium residue is 88.96 kg/ha,and the average residual potassium fertilizer is 109.85kg/ha,accounting for 44.75%and 55.26%The total residue rate was 51.60%on average,and the variation range is 28.30-72.60%.There are significant differences in nutrient environment between different plots.(5)According to the maize yield and potash fertilizer utilization level in Liaoning Province,the maize field is divided into four types of production.The yield of type ? plots is very urgent,and the fertilizer efficiency is good.In this kind of land,the fertilization of this land is reasonable and the level of soil supply is increased,which can achieve the purpose of high yield and high efficiency.For the production type ?,Soil nutrient conditions and maize varieties are improved under the condition of soil nutrient,and the yield of maize is further improved.For the production type ? and the production type ?,it is necessary to deal with the maize varieties,the soil basal supply potassium level and the potash availability Sexual improvement in order to make corn yield reached or close to high yield levels,to achieve high yield and efficient corn. |
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