Study On Soil Nutrien Obstacle Factors Of The Rice Spike Develop Abnormality In Jianghuai Hilly Land

From Feidong,Changfeng,Yingshang 2006,2007 in Rice heading flowering period and the temperature had never appear be like in 2003 so keep on excrescent heat the weather,so the air temperature teaches powder influence to the paddy rice flower pollination not big,then the paddy rice yield also wiould not be subjected to of influence.Paddy rice in Anhui Province plants area was about 2,200 thousand ha~2 and the rice yield was 13.5 billion kg.The rice plant areas and yield was about 40%and 50%in the food plants area with total yield in Anhui Province.In those years,rice occurred spike develop abnormality in Jianghuai Hilly Land,the amount of rice occurred areas was large and the rice reduction had great capacity,and these bringed farmer who planted rice a bigger economy loss.Expeling the interference of other factors of the paddy rice species, heat...etc,we investigated its basic reason was soil nutrient chemical element relevant.This artical used Systematic approach of soil nutrients method(ASI method)in Jianghuai Hilly Land which areas planted rice occurred spike develop abnormality.At the same time,this article also elaborated the temperature of these areas where rice occurred spike develop abnormality and the latter part of the rice-growing collection of normal rice plants and plant disease and the nutrient analysis.Through analysis of the original nutrient content in soil samples to determine the ASI method of the nutrients critical value as the standard,three counties which rice occured spike develop abnormality had low content of nitrogen in the soil,smaller than the critical value,slightly higher than the national soil survey which the average nitrogen content of 13.17ug/ml.Second,Changfeng points higher than the critical value of phosphorus, Feidong and Yingshang point below the critical value,the lack of more obvious. Changfeng points higher potassium content of the soil,probably for the critical value of 1.5 times,Yingshang points than the potassium content of the soil Feidong,but still below the critical concentration.Elements of calcium,magnesium,sulfur-rich,are three times greater than the critical value,it will not affect production.From the analysis of trace elements in the results,we could see that the Zn content was lower than the threshold,and soil manganese,boron,copper,iron content three times higher than the critical value.Through the three areas of soil P,K,Zn,and other elements of the three elements of test results adsorption know:Feidong point soil phosphorus on the curve for the adsorption was y=0.3915x+4.1406,Changfeng was y=0.4441x+16.339 and Yingshang was y=0.3333x+2.6389,the soil absorption capacity of the order of Yingshang＞Feidong＞Changfeng.The potassium from the soil for the absorption curve,Feidong y=0.4469x +66.662,Changfeng y=0.2699x+100.59,Yingshang y=0.3375x+68.703;Soil on the absorption of Zn for Feidong soil y=0.5311x+1.8411,Changfeng soil y=0.5437x +2.2617,Yingshang soil y=0.4708x+0.8994,on zinc absorption capacity fixed order of Yingshang＞Feidong＞Changfeng.Based on the above we can see that the Feidong soil phosphorus,potassium,zinc absorption strength of the order of P＞K＞Zn,Changfeng soil for the K＞P＞Zn,Yingshang soil for P＞K＞Zn.In the three pilot sites sorghum seedling pot experiment results showed that:nitrogen, phosphorus and potassium are the main limiting factor for production,processing phosphorus Feidong,Changfeng,Yingshang point of sorghum production in the soil decreased by 28.97%OPT,14.66,21.32%and 31.29%decrease lack nitrogen treatment, 37.97%,34.45%have reached significant levels.Feidong,Changfeng,Yingshang point of soil lack potassium sorghum production in OPT reduced 20.73%,14.66%,27.05%,of which reduce the production of Changfeng,at least,the last of Yingshang,Feidong largest, have reached significant.Zn deficiency in the pot experiment biomass,Feidong, Changfeng,Yingshang point of soil sorghum yield more OPT reduced 34.30%,41.61%, 4.10%,Evidently,Feidong,the main obstacle to soil nutrient factor and the order for Zn deficiency,nitrogen,phosphorus and potassium;soil Changfeng point deficit and the main obstacle of the order for zinc,nitrogen,potassium,phosphorus;soil Yingshang point deficit and the main obstacle to the order of nitrogen,Potassium,phosphorus,zinc.Through the availability of rice diseases farming and farming-soil layer below 20 cm large number of elements in the soil,we can see that these tests the pH of soil samples are between 5.5 to 7.1,organic matter content is not high and are less than 20 g/kg,the relative lack of.For nitrogen,the normal rice plants sick plants or the soil content of the relative lack of nitrogen,are the following topsoil topsoil than 20 cm,base of the lower nitrogen content.The available phosphorus,Feidong region in the middle,while other content is relatively low,phosphorus nutrient deprivation.The soil K,sick rice plants K content is higher than that of the corresponding normal rice plants.On the slow-K,whether sick or normal rice plants,are to be below the topsoil topsoil in the following 20 cm,this and other nutrient content of the law vary greatly.No matter which area of soil,rice plants under normal soil slow-potassium content is higher than the corresponding sick rice plants.And the availability of rice from the disease of the soil and tillage farming below 20 cm layer of trace elements in the soil,we can see that the exchange of calcium and magnesium-rich, rice,these two elements is not the lack of nutrients.For the effective sulfur,Feidong, Changfeng area in the middle and rich,Yingshang content is relatively low.In addition, Feidong only normal rice plants topsoil was lower than the corresponding sick rice plants, topsoil are other effective sulfur content higher than the topsoil below 20 cm.The trace elements boron,Feidong,in Changfeng normal rice plants under the topsoil was lower than that of rice plants under the topsoil sick,Yingshang the contrary.Finally the soil iron, manganese,copper,zinc,all of the tested areas of arable layer of soil above the topsoil in the following 20 cm,while the normal rice plants under the soil and topsoil topsoil 20 cm below the four trace elements in more than Or sick rice plants and the corresponding content of the soil under almost.In the above three areas of normal rice plants and plant disease large,medium and trace element analysis,the normal rice plants seeds,stems and leaves,roots of the total nitrogen,total phosphorus,potassium content are higher or slightly lower than the corresponding incidence Plants For all calcium and magnesium in full,normal rice plants and plant disease and there is no significant difference in regard to the whole of trace elements copper,normal rice,almost all in the incidence seed,and zinc higher than normal incidence seed to seed;normal rice Higher than the incidence of iron and manganese in plants.