Effects of Acid Regulation in Neutral Soil on Growth and Nutrient Absorption of Blueberry
In order to find out the acid adjusting method for growing blueberries in neutral soil in Yuxi City,six treatments were designed for'jewel'blueberries,L1(organic fertilizer for blueberries 1 kg/plant+ soil improvement of acidic substrate 10 L/plant+ sulfur powder 100 g/plant),L2(organic fertilizer for blueberries 1 kg/plant+ soil improvement of acidic substrate 10 L/plant),L3(peat 10 L/plant+ sulfur powder 100 g/plant),L4(peat 10 L/plant+ sulfur powder 200 g/plant),L5(soil improvement of acidic substrate 10 L/plant+ sulfur powder 100 g/plant),L6(soil improvement of acidic substrate 10 L/plant+ sulfur powder 200 g/plant).The effects of different acid-regulating materials on rhizosphere pH,growth index and nutrient absorption of blueberry were studied in neutral soil in greenhouse.The results showed that on the neutral soil with pH 6.94,different acid-adjusting materials had significant effects on soil pH,blueberry growth and nutrient absorption.Rhizosphere soil pH at harvest was 5.05 and 5.00 for L1 and L6,5.23 for L4 and 5.31 for L5,5.64 for L3 and 6.25 for L2.The order of growth indexes such as plant height,branch number and shade width,fresh fruit weight per plant and fresh leaf weight was L1＞L6＞L4＞L5＞L3＞L2.Therefore,when L1 or L6 treatment is applied on neutral soil,the pH of rhizosphere soil during the whole growth period is maintained between 4.28 and 5.05,which is most conducive to the normal growth of blueberries.The methods provide effective technical support for planting blueberries in neutral soil.
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