海南省主要橡胶园土壤养分限制因子

应用土壤养分状况系统研究法,研究海南省红田农场、公爱农场、岛西林场、南田基地的橡胶园土壤养分状况,结果表明:(1)盆栽试验巾养分亏缺顺序红田农场为:N>K>Mg>P>Zn>Mo>B>Cu>S>Ca;公爱农场为:N>P>K>Mg>S>Mo>Mn>Ca>Cu>Zn;岛西林场为:N>P>K>Mg>S>M0>Mn>Ca>Cu>Zn;南田基地为:N>Mg>P>K>S>Mo>Ca>Mn>Zn>Cu.(2)海南省橡胶园土壤普遍缺N,N均为第一限制因子,相对缺K、Mg、P、S,土壤贫瘠,应当加强土壤所缺元素的施用,才能提高土壤生产能力,从而实现橡胶的平衡施肥.(3)实验室测定结果与盆栽试验结果有较好的一致性.

Factors Limiting Soil Nutrients in Typical Rubber Plantations in Hainan Province

Soil nutrient regimes in rubber plantations were determined by using the soil nutrient regime method in Hongtian Farm, Gong'ai Farm, Daoxi Tree Farm and Nantian Base. The soil samples were collected, and their nutrients were detected in both laboratory and pot culture. Pot culture showed that the nutrient deficiency of the soil in pot culture was in the order of N>K>Mg>P>Zn>Mo>B>Cu>S>Ca in Hongtian Farm, N>P >K>Mg >S >Mo >Mn>Ca >Cu >Zn in Gongai Farm, N>P >K>Mg >S >Mo >Mn>Ca > Cu >Zn in Daoxi Tree Farm, and N>Mg >P >K >S >Mo >Ca>Mn >Zn >Cu in Nantian Base. It is thus clear that the soil in the rubber plantations in Hainan Province is deficient of N. N is the most important limiting factor, and the other limiting factors included K, Mg, P and S. The soil in Hainan Province is poor and has to be applied with soil-deficient nutrient fertilizer to improve the soil fertility. Pot culture results are consistent with the determination of the soil nutrients in laboratory.