| Experimentation is conducted in 2006-2007 in Guichi District Chizhou City and the School of Resources and Environment of Graduate laboratory in Anhui AgriculturalUniversity. The breed of rape is the 5th DeYou,the breed of rice is Fu Xiang You 98 which come from the company of TianHe , combining research methods of field experiments and lab experiments to study the effect of the different levels of fertilizer on the rape and rice yield, nutrient absorption, distribution and quality , the relationshipbetween the production and nutrient absorption is simulated in mathematics.Main results are as follows:1.The effect of different levels of fertilizer on nutrient absorption anddistribution of rape and riceConsidering the content , absorption and yield of nitrogen, phosphorus and potassium through whole rape , use treatment 7 as the best treatment. In a certain range, with the increase of fertilization among different treatments, the nutrient content and absorption of N,P,K have a increasing trend in the leaf of rape at different growth periods. Compared to other growth period, the nutrient content of N,P,K are the highest in shooting period, N and P nutrients have the largest increase in the seedling period (respectively 43.1-123.4% 5.7-65.9%), and P has the largest increase in the shooting period (13.0-47.0%); and compared to other growth period, all of absorption reach a maximum in bean period.The treatment N2P2K2 has the highest grease content. In a certain amount of nitrogen fertilization, increasing the use of nitrogen fertilizer can increase the distribution rate of nitrogen in the bean and decrease the distribution rate of nitrogen in nutrition organ ,and improve the quality of rape.Using treatment 11 as the best treatment in rice. In a certain range, with the increase of fertilization among different treatments, the nutrient content and absorption of N,P,K have a increasing trend in the leaf of rice at different growth periods. Compared to other growth period, the nutrient content of N,P,K are the highest in Seedling period, and absorption are highest in jointing period. N nutrients have the largest increase in the seedling period(111.4-227.8%);P,K nutrients have the largest increase in the jointing period(respectively12-14.8%,40.8-60.3%).2..The effect of different levels of fertilizer on rape yield According to function equations of nitrogen and phosphorus fertilizers effects on rape are y = -0.0162x2 +9.315x +921.735, y = -0.00722x2 + 4.706x + 1606.4,the best theorical scope of application of nitrogen and phosphorus can be gained respectively 234.7-287.26 8kg/hm2, 220.8-325.7 8kg/hm2, the corresponding the best and maximum yield are2215.6-2259.7 8kg/hm2, 2293.4-2372.88kg/hm2.According to function equations of nitrogen, phosphorus and potassium fertilizers effects on rice are y = -0.0711x2 +32.022x +5480.243, y = -0.0104x2 +4.367x +8160.36, y = -0.00459x2 +2.689x +8267.52,the best theorical scope of application of nitrogen , phosphorus and potassium can be gained respectively206.6-225.2 kg/hm2, 148.7-210.0kg/hm2, 86.6-292.9 kg/hm2, the corresponding the best and maximum yield are9061.3-9085.8 kg/hm2; 8618.8-8579.8kg/hm2; 8466.0-8661.4 kg/hm2.3 Nitrogen nutrional diagnoses indexs for the leaf of rape and riceThe optimum nitrogen absorption and critical value of rape for the different growth stages is:seedling period 20.28-26.57 kg/hm2, shooting period 32.75-39.21 kg/hm2, bean period 74.46-91.89 kg/hm2. When nitrogen absorption of leaf low 20.28kg/hm2, 32.75kg/hm2, 74.46kg/hm2 in seedling period, shooting period, bean period, the normal growth of Rape will be affected, occurring the phenomenon of the lack of nutrition or growth disorders and leading to reduction of production; when nitrogen absorption of leaf exceed 20.28kg/hm2, 32.75kg/hm2, 74.46kg/hm2 in seedling period, shooting period and bean period, the yield of rape does not increase significantly, or even yield can be reduced by excess nitrogen.lt can be concluded that the nutrition diagnosis indicators for in the leaf of rape at different growth stages : seedling period 1.48-1.95%, shooting period4.65-5.56%, bean period 3.40-4.10%.The optimum nitrogen absorption and critical value of rice for the different growth stages is:Seedling period: 39.08-51.42kg/hm2, jointing period: 69.55-78.66kg/hm2,and tassel period: 56.79-61.82 kg/hm2. It can be concluded that the nutrition diagnosis indicators for in the leaf of rice at different growth stages: Seedling period: 3.92-5.16%, jointing period: 2.45-2.77%,and tassel period: 2.25-2.45%.4,The quantitative relationship between absorption of nitrogen and yield in rape and rice leaves can be expressed by the following mathematical model. The quantitative relationship model is Y=b0+b1/X.Using the equation about absorption of nitrogen of rape and yield in bean stage : Y = 2742.05-44328.74/X,and the equation about absorption of nitrogen of rice and yield in jointing stage : Y = 12552.7 -272702/X, can forcast the latter yield. |
