Response of Soil Chemical Properties to Application of Organic Manures of Diverse Sources Integrated in Different Ratios with Urea

The present research trail was carried out after harvest of maize crop on calcareous soil (19% lime on w/w basis) of Pakistan, District Nowshera soil series [Piedmont alluvium, silty clay loam, Ustochrept] to study its chemical properties as affected by application of organic manures of different sources integrated with urea. The treatments of the present study were divided into 3 groups based on the combination ratios such as 1:1, 3:1 and 1:0. Total 13 treatments such as: T1=alone Urea (control), T2 [Urea+SSB (1:1)], T3 [Urea+SCB (1:1)], T4 [Urea+PL (1:1)], T5 [Urea+FYM (1:1)], T6 [Urea+SSB (3:1)], T7 [Urea+SCB (3:1)], T8 [Urea+PL (3:1)], T9 [Urea+FYM (3:1)], T10=alone SSB, T11=alone SCB, T12=alone PL, T13=alone FYM were used and each treatment was replicated thrice. The combination ratios of the treatments were based on %N (required amount of N is 120 kg/ha) received from Urea and organic manures. Results of the experiment revealed that all the treatments have significantly affected (P>0.05) the soil chemical properties such as pH, E. C, total nitrogen content and organic matter content while bulk density was non-significant. By comparing various treatments groups, treatments having 1:1 combination ratio (T2, T3, T4 and T5) have shown best results in case of pH, E. C and nitrogen content of post-harvest soil. They have mediated the pH and E. C to levels favorable for plant growth and N uptake. While in case of organic matter content maximum results were obtained for treatments having combination ratio of 1:0 i-e (T10, T11, T12 and T13). From the present study it was concluded that all the treatments except control have altered the chemical status of soil to a favorable soil enviro responsive microbial activity and plant growth. Such studies on different soil series under different climatic conditions is advised for wide spread application and authorization of results.