糖厂碳法滤坭对赤红壤上柑桔施用效果初探

试验结果表明，施用碳法滤坭可明显地提高土壤的ｐＨ值和土壤的速效磷含量；适量滤坭配施钾肥可比单施钾肥显著或极显著地提高柑桔的产量，明显地提高柑桔果汁的Ｖｃ和柠檬酸含量，柑桔的可溶性固形物含量、可食部分和果汁含量也有提高；单施滤坭对提高柑桔产量和改善柑桔品质也有一定的效果．滤坭配施钾肥对提高柑桔产质的效果优于与其等当量的石灰配施钾肥，故认为碳法滤坭可代替石灰应用于改良赤红壤的酸性．

Preliminary study on Effect of Applying Filter cake on Orange Growth on Iatosolic Red Soil.

The results of field trial indicated that soil pH and soil available P content were increased by applying filter cake. Compared with the single K fertilizer treatment, suitable amount of filter cake combined with K fertilizer could significantly or very significantly increased the orange yield, the contents of vitamin C and citric acid in the orange juice. The soluble solid contents, the juice percentage and the edible portion of the orange fruits were also increased. Good effects on the yield and quality of orange were showed by single filter cake application. The effect on the yield and quality of orange by the treatment of filter cake combined with K fertilizer was better than that of equivalent lime combined with K.So filter cake could replace lime to neutralize the acidity of latosolic red soil.