Screening And Evaluation Of The Optimal Combination Of Rice Fertilizer Application And Seedling Density In The Cold Area Of Eastern Jilin Province

Aiming at the low temperature damage of rice in cold areas in eastern Jilin Province,on the basis of individual technologies,the sub-techniques of rice planting density,water and fertilizer control factors were assembled and integrated to clarify the control technology model of rice cold tolerance in cold areas of Jilin Province.In2019,the experiment was carried out in Guaizikang Village of Panshi City and Yanbian University College of Agriculture,and the experiment was conducted in Guaizikang Village of Panshi City in 2020.The conventional rice planting variety Jihong 6 in Jilin Province was used as the experimental material to study the effects of different technical models on rice.To study the effects of different technical models on tillering,dry matter weight accumulation,photosynthetic physiological indicators,yield traits and yield of rice during the whole growth period,and evaluate the economic benefits and farmland environmental benefits of different technical models,and select suitable for the cold and cold in eastern Jilin Province The best rice cultivation mode applied in the region.The experiment set up 10 treatments,T1（medium fertilization method+high density）;T2（medium fertilization method+medium and high density）;CK₁（medium fertilization method+medium density）;T3（medium fertilization method+medium and low density）;T4（medium fertilization method+low density）;T5（high fertilization method+high density）;T6（high fertilization method+medium and high density）;CK₂（high fertilization method+medium density）;T7（high fertilization method+medium and low density）;T8（high fertilization method+low density）,sampling and determination are carried out according to the requirements of each period.The main research results of this study are as follows:1.In 2019 and 2020,the effective tiller number and dry matter quality of T6treatment in Panshi area were higher than that of CK₁.In addition,the photosynthetic rate of T6 treatment in Panshi area was higher than that of CK₁in 2019,and the leaf area index,chlorophyll value,and photosynthetic rate of T6 treatment decreased slowly during the whole growth period of rice,and accumulated higher dry matter quality.2.In 2019,the output of T6 treatment in Panshi area was higher than that of CK₁,and the output of T6 was 10 057.5 kg/hm²,which was 14.9%higher than that of CK₁.In 2020,the output of T6 treatment in Panshi area was higher than that of CK₁,and the maximum output of T6 treatment was 10 624.5 kg/hm².The yield of CK₁increased by 14.2%;in 2019,the yield of T2 treatment under medium fertilization in Longjing area was higher than that of CK₁,which was 10 768.5 kg/hm²,which was31.5%higher than that of CK₁.3.The partial productivity of nitrogen,phosphorus,and potash fertilizers in Panshi area is higher than that in Longjing area,and the accumulated temperature of activity throughout the year in Panshi area is higher than that in Longjing area,indicating that Panshi area is more suitable for higher fertilizer input with larger fertilizer input;Longjing area is more suitable for fertilizer input a relatively low amount of medium fertilization.4.Different densities have significant effects on rice tillers,dry matter weight,leaf area index,yield and evaluation indicators.The high-density and medium-high-density treatments under the two fertilization rates in the Panshi area have higher yields than the medium planting density;the two types of fertilization in the Longjing area In terms of quantity,medium and high density processing yields the highest yield.5.In 2019,the economic benefit of T6 treatment in Panshi area is 26 273.3yuan/hm²,which is an increase of 3 506.3 yuan/hm²compared to CK₁;in 2020,the economic benefit of T2 treatment in Panshi area is 27 860.9 yuan/hm²,which is an increase of 3 544.1 yuan/hm²than CK₁;2019 In the year,the economic benefit of T2treatment in Longjing area reached 28 369.1 yuan/hm²,an increase of 7177.1yuan/hm²compared with CK₁.6.In 2019,the comprehensive score of T5 treatment farmland environment in Panshi area was the highest,which was 0.155 points higher than CK₁;the comprehensive score of T2 treatment farmland environment in Longjing area was higher than CK₁0.096 points.In summary,the Panshi area is more suitable for the cultivation technology model of high fertilization method combined with medium and high seedling density,and the Longjing area is more suitable for the cultivation technology model of medium fertilization combined with medium and high seedling density.Therefore,the selection and evaluation of the optimal combination of rice fertilizer and density in the cold area of eastern Jilin Province should be established based on the combination of key cultivation techniques such as suitable density and suitable fertilizer amount in different regions,so as to realize the overall improvement of rice stress resistance,yield and quality.So as to achieve the purpose of increasing production and efficiency.