【摘要】 本文对桂西北环江县中科院科技扶贫基地肯福示范场柑橘示范园92片果园土壤营养状况的分析表明,该示范园有机质含量丰富,全氮、全磷偏低,水解氮、有效磷基本适宜,钾素缺乏,土壤偏酸性;果园之间主要土壤养分的变异系数都在16%以上,土壤pH值的变异系数为4.5%。不同产量级果园土壤养分的差异,主要表现在水解氮和速效钾含量上,是低产园提高产量的限制因素,水解氮和速效钾与柑桔产量分别有极显著和显著的相关性,初步提出了果园土壤水解氮、速效钾的丰缺指标。更多还原

【Abstract】 The results of soil fertility of 92 orchards in the citrus demonstration orchards of Kenfu demonstration plot were as follow:soil fertility on the area was characterized by abundant organic matter,low total nitroge,total phosphorus and potassiun,optimum hydrolyable nitrogen and available phosphorus,and strong acifity.The major nutrient variable coefficient in soil in different citrus orchards are over 16% and pH variable coefficient of the soil is 45%.The citrus orchards of different yield grades showed that the most significant soil chemical characteristic relatives to citrus nutrition seems to the amount of readily hydrolyable nitrogen and available potassium.And that was the restriction factor effect on the improving of the output.As a result,there was an extremely positive correlation between citrus yields and hydrolyable nitrogen and available potassium.Also,the indexes of anundance and shortage of hydrolyable nitrogen and available potassium in soils were put forward in this paper.更多还原