Effects of organic fertilizer nitrogen partial replacement of chemical fertilizer nitrogen on growth and nutrient accumulation and utilization of intercropped Amorphophallus bulbifer in rubber plantation
In order to explore the rational nitrogen application method for intercropped Amorphophallus bulbifer in rubber plantation,the effects of organic fertilizer nitrogen partial replacement of chemical fertilizer nitrogen on physiological characteristics,yield,quality and nutrient accumulation and utilization of intercropped A.bulbifer in rubber plantation were studied.Six treatments were set up,including T1:control without nitrogen,T2:local normal chemical fertilizer nitrogen(N 450 kg/hm2),T3:80%normal chemical fertilizer nitrogen+20%organic fertilizer nitrogen,T4:80%normal chemical fertilizer nitrogen,T5:60%normal chemical fertilizer nitrogen+20%organic fertilizer nitrogen,T6:30%normal chemical fertilizer nitrogen+50%organic fertilizer nitrogen.The leaf morphological indexes,the number of bulbils of the leaves and plant lodging rate,yield and quality of underground corms,soluble sugar,starch,glucomannan content and nitrogen,phosphorus and potassium content and nitrogen use efficiency were determined at maturity stage.The results showed that the plant height,stem diameter,the number of bulbils of the leaves and propagation coefficient of A.bulbifer increased,the lodging resistance was enhanced,and the yield,fresh weight per plant,expansion coefficient and nitrogen,phosphorus and potassium absorption and nitrogen use efficiency were increased in organic fertilizer replacing partial chemical fertilizer nitrogen treatment,compared with pure chemical fertilizer nitrogen application treatment.The optimal nitrogen application mode for the intercropped A.bulbifer was 80%chemical fertilizer nitrogen+20%organic fertilizer nitrogen or 30%chemical fertilizer nitrogen+50%organic fertilizer nitrogen.
intercropping in rubber plantationsreplacing partial chemical fertilizer nitrogen with organic fertilizer nitrogenphysiological characteristicsyieldnutrient absorption
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