柑橘渣对玉米、水稻生长和土壤肥力

通过盆栽试验研究施用柑橘渣对玉米、水稻生长和土壤肥力性状的影响。结果表明，施用不同用量柑橘渣增加水稻株高，降低玉米株高（施柑橘干渣5g/kg土的Oc5处理除外）。Oc5处理对玉米的生物量有明显的提高作用，而Oc20处理（施柑橘干渣20g/kg土）对提高水稻生物量的作用最大。柑橘渣促进玉米吸收钾素，抑制氮素和磷素的吸收。Oc20处理对水稻的全氮、全磷、全钾吸收有很好的促进作用。施用柑橘渣对土壤pH值影响不大，土壤有机质含量随柑橘渣施用量的增加而提高，其中玉米土壤有机质提高18．6％-69．7％，水稻土壤有机质提高0．5％-7．1％，旱地（玉米）土壤碱解氮、有效磷、有效钾和淹水（水稻）土壤碱解氮含量也有随着柑橘渣施用量的增加而增大的趋势。

Effects of citrus-pericarp dregs on growth of maize,rice and fertility characteristics of soil

In the pot experiment, the citrus-pericarp dregs were applied on rice and maize to study their effects on the growth of maize and rice, and the fertility characteristics of the soil. The results indicated that applying different treatments of citrus pericarp dregs could increase the plant height of rice while decrease the plant height of maize except for the Ocs treatment （5 g of dry citrus pericarp dregs per 5 kg soil）. The Oc5 treatment could enhance the biomass of maize obvi- ously, while the Oc20 treatment had the most obvious effect on enhancing the biomass of rice. The citrus-pericarp dregs could promote the absorption of potassium of maize but restrain the uptake of nitrogen and phosphorus. The Oc20 treatment could make rice absorb nitrogen, phosphorus and potassium nutrients well. Except for soil pH, the organic matter content in soil was increased with the increase of citrus-pericarp dregs, and that of maize and rice was increased by 18.6%-69.7% and 0.5%-7.1%, respectively. Moreover, the available nitrogen, phosphorus and potassium of maize in dry land and the available nitrogen of rice in submerged soil had an increasing trend with the increase of citrus-pericarp dregs.