The Effects of The Conjunctive Use of Compost Tea and Inorganic Fertilizers on Radish (Raphanus sativus) Nutrient Uptake and Soil Microorganisms

Abstract

PPLICATION of organic amendments to soil is an important …….management strategy for enhancing soil fertility and microorganisms. A pot experiment was conducted under greenhouse conditions to investigate the effect of compost and compost tea(CT), mineral fertilization only complete (N 100) and half (N 50) recommended doses of nitrogen or combined with two kinds of compost tea (according to extract methods) molasses compost tea (CT1) and molasses compost tea+ ammonium sulphate (CT2) with three application ratios (v:v) (1:25, 1:50 and 1:75) on NPK uptake of leaf and root of radish (Raphanus sativus), soil nutrient status after harvest, and soil microbial populations. Application of CT1 showed that N uptake of radish leaf was about 30.1% higher than that of CT2. CT1 compost tea also increased P and K uptake by 12.6 and 51.5%, respectively, compared with CT2 application. At the end of experiment, soil N, P and K contents were greater in compost amended soil,whereas N uptake of radish leafand root showed only a significant positive correlation with soil N content in the CT2 + N treatments. The populations of the different microorganisms were greater in CT treatment, and increased with time as well. However, it was found that there was a significant negative correlation between leaf and root N uptake of radish and population of anaerobic N 2 fixing bacteria in soil after harvest.