土壤养分状况系统研究法在广东蕉园的改进应用

分别采用高梁[sorghum bicolor (L.) moench]和香蕉(Musa acuminata colla)作为指示作物,利用ASI法进行广东香蕉园土壤养分评价的比较研究,以确定ASI法在广东蕉园土壤中的适宜指示作物.研究结果表明:(1)高粱盆栽试验结果表明,各香蕉园土养分亏缺顺序为番禺南沙点P>N>Zn;番禺东涌点和灵山点N>Ca;高州沙田点N>Ca>Mg;博罗长宁点N>P>Mg;四会大沙点N>P.(2)香蕉盆栽试验结果表明,各香蕉园土养分亏缺顺序为番禺南沙点N>P>K;博罗长宁点和四会大沙点N>P;N是番禺东涌点、番禺灵山点及高州沙田点的唯一限制因子.(3)N是广东省番禺南沙点、东涌点和灵山点、高州沙田点、博罗长宁点及四会大沙点6个香蕉主产区有代表性香蕉园土的第1养分限制因子.(4)建议在应用土壤养分状况系统研究法时,盆栽试验仍可采用高粱作指示作物.

Improvement in Application of ASI to the Soil of Banana Plantation in Guangdong Province

Sorghum is a traditional indicating crop of ASI systematic approach. Sorghum and banana were used separately as indicating crops to carry out the soil nutrient appraisal comparative research of banana plantation in Guangdong Province by ASI systematic approach, in order to find out the suitable indicating crop of ASI systematic approach on the banana plantation soil in Guangdong Province. The sorghum's pot experiment showed that the nutrient deficiency in the banana plantation soils under trial was in the order of P>N>Zn at the Nansha site in Panyu, of N>Ca at the Dongchong site in Panyu and at the Lingsha site in Panyu, of N> Ca>Mg at the Shatian site in Gaozhou, of N>P>Mg at the Changning site in Boluo, and of N>P at the Dasha site in Sihui. The banana's pot experiment showed that the nutrient deficiency in the banana plantation soils was in the order of N>P>K at the Nansha site, and of N>P at the Changning site and at the Dasha site. The N was the only limiting factor at the sites of Dongchong, Lingshan and Shatian. The N was the first nutrient limiting factor of representative soils in the banana plantations at the sites of Nansha, Dongchong, Lingshan, Shatian, Changning and Dasha in Guangdong Province. It is suggested that the sorghum be the crop indicator for pot experiment when the systematic research method for soil nutrient status were used.