Effect of phosphorus and potassium application on rapeseed yield and nutrients use efficiency
Three field trials were carried out in Hubei Province along the Yangtze River middle area demonstrates how balanced fertilization, focusing on phosphorus (P) and potassium (K), improves rapeseed yield and nutrient use efficiency. Field trial 1 shows that rapeseed (Brassica napus L.) yield increased with P application rate up to 135 kg P2O5/hm2. Application of 135 kg P2O5/hm2 produced the highest yield increment of 1,460 kg/hm2, about 2.2 times higher than the zero P treaument. The amount of N, P, and K absorbed by aboveground biomass in plots treated with 135 kg P2O5/hm2 was 3.0, 4.1, and 2.9 times as much as nutrients absorbed with no P applied. Application of 135 kg P2O5/hm2 resulted in the highest nitrogen (N) recovery efficiency of 52.3％ while the zero P treatment only recovered 17.3％. Field trial 2 shows seed yields were significantly affected by K application. Compared with the zero K treatment, plots treated with 150 and 300 kg K2O/hm2 produced 17.5 and 31.7％ higher yields, respectively. The N utilization efficiency of rapeseed upland part was improved by 1.6％ with 75 kg K2O/hm2, 7.7％ with 150 kg K2O/hm2, 6.7％ with 225 kg K2O/hm2, and 9.0％ with 300 kg K2O/hm2. A significant yield interaction was observed between P and K application rate from field trial 3. Compared to the check (NB), application of P increased yield by 467 kg/hm2,while K decreased yield by 41 kg/hm2, and P plus K increased yield by 1,360 kg/hm2. Recovery of P for the NPKB treatment was 20％ higher than the NPB treatment and K recovery for the NPKB treatment was 76％ higher than the NKB treatment.
Rapeseed (Brassica napus L.) Phosphorus (P) Potassium (K) Yield Nutrients recovery efficiency
LU Jianwei ZOU Juan CHEN Fang
Resources & Environment College, Huazhong Agricultural University, Wuhan, 430070, China Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
1029-1032
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）