不同缓释肥料对辣椒生态化学计量特征及产量的影响

摘要

以黔椒4号为试验材料,采用完全随机试验设计,探讨了不同用量(1 800、1 500、1 200 kg/hm2)的两种缓释肥料(T1,N∶P2O5∶K2O=18∶9∶18;T2,N∶P2O5∶K2O=20∶10∶15)对辣椒茎叶、果实全氮(TN)、全磷(TP)、全钾(TK)养分及化学计量特征的影响.结果表明:两种缓释肥的效果差别不大,随着施肥量的增加,辣椒产量均呈现出先增加后降低的趋势,以1 500 kg/hm2的处理产量最高,达7 000 kg/hm2以上;辣椒茎叶N/P要明显高于果实N/P,当施肥量为1 800和1 200 kg/hm2时,茎叶N/P都要显著低于施肥量1 500 kg/hm2的水平,表明在施肥过量和不足的情况下,辣椒生长缓慢或贪青晚熟[21],茎叶生长速率加快,因此茎叶N/P相对较低.%Using qianjiao No.4 pepper as experimental material,the effects of two controlled/slowed-release fertilizers (T1,N ∶ P2O5 ∶ K2O=-18 ∶ 9 ∶ 18;T2,N ∶ P2O5 ∶ K2O=20 ∶ 10 ∶ 15) on pepper stem,firuit TN,TP,TK contents and ecological stoichiometric characteristics was discussed.The results showed that pepper fruit yield was not significant different between two controlled/slowedrelease fertilizers.It showed a trend of increasing first and then decreasing with increase of fertilizer.The yield of the treatment with 1 500 kg/hm2 fertilizer usage was the highest,over 7 000 kg/hm2.The numbers of pepper stem N/P were higher than fruit numbers.Pepperstem N/P contents of 1 800 and 1 200 kg/hm2 were significant lower than 1 200 kg/hm2 usage.The pepper showed low-growing or extendgrowth when fertilizer lack or excessiveness,and pepper stems N/P contents decreased because of increase of growth rate.