DIFFERENT ORGANIC MANURES ON THE AVAILABILITY OF SOIL MACRONUTRIENTS

The present study is conducted to assess the improvement of the macro nutrient status of soils after treating them with different organic manures, which will give an overall idea about the performance of the manures to add major nutrients to the soils and their acceptability as nutrient sources for crop production by using 18 plot in Soil Chemistry Laboratory, Khulna University, Bangladesh from January to August, 2015. Samples were collected from Rupsha, Khulna. It was found that, the total nitrogen (N) in GM, GLM, KW, PM, and VC treated soils, and in the Reference or Control soil (C) are 0.112%, 0.108%, 0.124%, 0.099%, 0.111% and 0.101% respectively. The available Phosphorus (P) in GM, GLM, KW, PM, and VC treated soils, and in the Reference or Control soil (C) are 12.52 ppm, 15.61 ppm, 22.69 ppm, 35.32 ppm, 26.71 ppm and 31.9 ppm respectively. The available potassium (K) in GM, GLM, KW, PM, and VC treated soils, and in the Reference or Control soil (C) are 0.075%, 0.089%, 0.079%, 0.079%, 0.066% and 0.071% respectively. The available sulfur (S) in GM, GLM, KW, PM, and VC treated soils, and in the Reference or Control soil (C) are 8.63 ppm, 7.56 ppm, 5.94 ppm, 7.01 ppm, 11.33 ppm and 3.24 ppm respectively. The available calcium (Ca) in GM, GLM, KW, PM, and VC treated soils, and in the Reference or Control soil (C) are 0.46%, 0.40%, 0.42%, 0.48%, 0.44% and 0.34% respectively and the available magnesium (Mg) in GM, GLM, KW, PM, and VC treated soils, and in the Reference or Control soil (C) are 0.032%, 0.076%, 0.062%, 0.034%, 0.054% and 0.028% respectively.  From the current research various essential nutrients for crop growth especially N, K, S, Ca and Mg have been increased by the application of different manures in the soil but P has been decreased in the soil for the soil’s high pH value. In conclusion, if the manures are incorporated with soil for a long time, there is a very good possibility of their adding essential nutrients to the soil.