Influences Of Different Fertilizer Proportion On Heavy Metals Absorption And Yield In Rice

To reduce the accumulation of heavy metals in rice, agronomy technical measures such as irrigation management, fertilizer management are the key to ensure the safety of rice production. In order to explore the impact of different fertilizer proportion on heavy metal absorption and on yield of rice under the same fertilizer rate conditions, Xiangzaoxian32, Zhongjiazaol7, Xiangwanxianl2 and Wuyou308 were selected as test objects, and were experimented in yiyang jianfeng plot in 2015,in which fertilizer application was divided into 6 treatments:using as Basal fertilizer, Tillering fertilizer, Earing fertilizer, Granulate xiF6 ?0:5:3:2? and CK?No fertilization at all?. We used Apollo compound fertilizer ?N-P₂O₅-K₂O:15-10-15>40%? 50kg/mu. The plot area is 28m², and the test was repeated three times. The results were showed as follows:1. Influences of different treatments on yields:CK treatment resulted in the lowest production in four varieties, and displayed very significant differences compared with other fertilization treatments. In this test, the yields of CK -treatment of four varieties are 236.3kg/mu?Xiangzaoxian32?,287.5kg/mu?Zhongjiazaol7?,366.8kg/mu?Wuyou308? and 307.2kg/mu?Xiangwanxianl2?. Compare with other different fertilizer treatments, yields under treatment F6 showed a significant difference, which are 373.0kg/mu?Xiangzaoxian32?, 373.0kg/mu?zhongzaojial7?,472.2kg/mu?woyou308? and 409.8kg/mu?Xiangwanxian12?. Due to differences in varieties, the maximum yields under different treatments are:F1: 52.1kg/mu?Xiangzaoxian32?,F2:499.8kg/mu?Zhongjiazao17?,F3:625.9kg/mu?Wuyou308?,F 3:466kg/mu?Xiangwanxian12?.2. Influences of different treatments on the production structure:Tests showed that different fertilizer treatments have tiny effects on three varieties in terms of seed setting rate, grain weight and harvest index irrespective of Xiangwanxianl2 and there is no significant difference exist. Panicle and grain numbers differ in varieties under different treatments.in Xiangzaoxian32,the most productive panicle is under treatment F2:462sui/m²;the most grain number is under treatment F1:103.11i/sui.in Zhongjiazao17 the most productive panicle is under treatment F4: 429sui/m²;the most grain number is under treatment F6:134.21i/sui. n Wuyou 308 the most productive is under treatment F1:565sui/m²;the most grain number is under treatment F6145.41i/sui.3. The highest Cd content in rice represented in xiangzaoxianl2, Zhongjiazaol7 and Xiangwanxianl2 is under CK treatment of 0.574mg/kg,0.582mg/kg and 0.331mg/kg respectively. The highest Cd content in Wuyou308 is under treatment F6:0.366mg/kg. The second place of Cd content in Xiangzaoxian32 and Zhongjiazaol7 are under treatment Fl:0.439mg/kg?Xiangzaoxian32? and 0.574mg/kg?Zhongjiazao17?. In Wuyou308, the second place Cd content is under CK treatment:0.321mg/kg, the second place Cd content in Xiangwanxian12 is under treatment F2:0.151mg/kg.4. In Xiangzaoxian32, the minimum rice Cd content is under treatment F4:0.207mg/kg. In Zhongjiazaol7, the minimum rice Cd content is under treatment F4:0.147mg/kg. In Wuyou308, the minimum rice Cd content is under treatment F5:0.279mg/kg. In Xiangwanxianl2, the minimum rice Cd content is under treatment F4:0.079mg/kg.5. Different fertilizer proportion caused almost no difference in the content of Cr,As,Pb and other heavy metals in rice.It equals that there are no apparent difference in the accumulation of heavy metals in rice with different fertilizer proportion and there are no disposal to reduce the content of heavy metals in rice apparently.