Hiệu quả của chế phẩm hữu cơ vi sinh chứa bốn dòng vi khuẩn Rhodopseudomonas sp. đối với hấp thu đạm, nhôm và sắt trong hạt lúa trồng trên đất phèn huyện Phụng Hiệp, tỉnh Hậu Giang ở điều kiện nhà lưới

Abstract

Acid sulfate soil (ASS) contains high aluminum and ferrous concentrations that might cause the reduction of nutrient uptake and an increase of toxic accumulation. Rhodopseudomonas sp. has ability to reduce aluminum and ferrous toxicity of ASS for rice cultivation. The objectiveof this research was to evaluate the efficacy of biofertilizers containing four acid-resistant R. palustris VNW64, VNS89, TLS06 and VNS02 on theaccumulation of nitrogen and toxic compounds in rice grains. A two factorial experiment was conducted in a randomized complete block design on ASS collected from Phung Hiep district, Hau Giang province under nethouse conditions. Therein, the first factor was biofertilizer application including four mixedbacterial strains, only VNW64 and no biofertilizer application. The second factor was inorganic N fertilizer application containing 0, 50, 75 and 100 kg N ha-1. The results showed that thetreatments applied either with biofertilizer containing four mixed bacterial strains or biofertilizer containing onlyVNW64 helped to increaseN uptake from39.7 to 49.2%, to reduce Al uptake from 18.4 to 30.4% and to reduce Fe uptake from 0.1 to 2.7% in rice. The biofertilizers containing a mixture of four strains or one bacterial strain showed their efficacy in enhancement of N uptake and reduction of Al and Fe accumulation in rice grains when cultivated on ASS.