Analysis of single rice nutrition utilization by TechnoGIN——A case study of single-rice in Pujiang County

In this paper,using single rice as the research object,technoGIN model was employed to analyze and predict the change of nitrogen under single rice cultivation of Pujiang County at regional scale through setting up land use units.The results showed as follow: 1)Based on the calculated results using the TEF(Technology-E-Future) of TechnoGIN model,the nitrogen(N) input,N leaching loss and volatized loss could be reduced by 23%50%,25%48%,and 41%59% comparing to TAC(Technology-A-Current),respectively.Meanwhile,the apparent N recovery efficiency could be increased from 0.2 to 0.3.Suppose TBF(Technology-B-Future) was used contrasted with TAC,the input of N can be reduced by 40%60%,the leaching of N can be reduced by 32%60%,the vaporization of N can be reduced by 54%73% and the apparent N-recovery efficiency can be increased to 0.42 by using TBF.This is also consistent with the report that N-recovery efficiency of rice can achieve by 0.50.6.So it can be concluded that TechnoGIN is a good calculating tool for analyzing the plant nutrient utilization in regional range,though some of its functions still worth discussing.2) Two conclusions of the loss of nitrogen through leaching and vaporization were drawn as follows: First,with the increase of yield,the loss of nitrogen through leaching and vaporization during production of single rice decreased at the same input of N in the same land unit.Second,the more input of N,the more loss of N through leaching and vaporization on the same land unit under the same yield.This agreed with pertinent report.Results calculated by TechnoGIN model based on more than thirty years trials can offer some theoretical foundation for routine thinking,though the loss of nitrogen through leaching and vaporization still remain to be verified.3) By using TechnoGIN,the fertilizer nutrient on the single harvest rice is matched and calculated.The TAC level calculated by TechnoGIN is consisted with various of fertilizer used at present.From the result of calculation of other engineering levels,organic fertilizer arranged in pairs with inorganic fertilizer is one of the main ideas of TechnoGIN.It is showed that the balance of nutrient utilization not only can increase yield of crop,but also can reduce the pollution caused by agricultural production,which agreed with the normal analysis.And the nutrient factor generated by TechnoGIN has definite directive significance to the future agriculture production.