摘要
在田间试验条件下研究了不同磷肥用量对黑麦草Lolium multiflorum产量及经济效益的影响。结果表明:在氮钾肥基础上施用磷肥,可以明显提高黑麦草的分蘖数、株高和最大表观叶面积等生长指标;黑麦草鲜草产量随着磷肥用量增加呈先升高后降低趋势,施磷(P2O5)135 kg/hm2时产量最高,为59.75 t/hm2;随着磷肥用量的增加,黑麦草对氮、磷和钾素的积累量逐渐增加。经济效益分析结果表明,施磷135 kg/hm2时净利润最高,增收3 296元/hm2,肥料产投比达4.79。
A field trial was carried out to study the effect of different phosphorus （P） fertilizer rates on the yield and benefit of ryegrass. It was showed that P application significantly promoted the plant tillers, height and leaf area of ryegrass. The fresh yield increased first and then decreased with the increasing P application rates. The rate of 135 kg/hm^2 of P2O5 produced the highest yield （59.75 t/hm^2） .The accumulation of nitrogen, phosphorus and potassium in ryegrass also increased with the increment of P application rate. The result economical benefit analysis showed that the profit was optimum when P2O5 applied at the rate of 135 kg/hm^2,which achieved net profit of 3 296 yuan/hm^2,the VCR reached 4.79.
出处
《草业科学》
CAS
CSCD
2006年第10期18-22,共5页
Pratacultural Science
基金
加拿大钾磷研究所(PPI/PPIC)国际合作项目(Hub-20)
华中农业大学科技创新项目(A016)
