DIRECT AND RESIDUAL EFFECT OF ORGANIC MATERIAL (SHRIMP SHELL POWDER) ON RADISH-SPINACH CROPPING SYSTEM

Abstract

Two consecutive pot experiments were conducted under the net house of Sher-e-

Bangla Agricultural University (SAU), Dhaka, Bangladesh, during November 2020 to January 2021, to investigate direct and residual the effect of organic material (shrimp shell powder) on yield performance of radish- spinach cropping system. BARI mulashak-1 was used as first crop and BARI palonshak-1 was used as second crop. After harvesting first crop (radish), the second crop (spinach) was sown without using any plant nutrients. The experiment was consisted of single factor with eight (8) treatments & four (4) replications following Completely Randomized Block Design (RCBD).The treatments were, T

: 0% shrimp shell powder, T 2 : 0.1% shrimp shell powder, T ii 3 1 : 0.2% shrimp shell powder, T : 0.3% shrimp shell powder , T 5 : 0.4% shrimp shell powder , T : 0.5% shrimp shell powder, T 7 : 0.75% shrimp shell powder and T 8 6 : 1% shrimp shell powder . Result revealed that significant variation was observed in germination (%), plant height (cm pot -1 ), fresh weight (g pot -1 ), oven dry weight (g pot -1 ) pot of radish and spinach. In case of first crop (radish), the yield and yield contributing characters increased significantly and the treatment T 4

and T

show similar and better performance than others but in the treatment T 7 5 and T 8, negative response was observed as germination (%) has dropped suddenly. In case of second crop (spinach), the yield and yield contributing characters positively responded with the increased rate of organic material (shrimp shell powder) and highest plant height (34.28cm pot -1 ), highest average fresh weight (308g pot )and average oven dry weight (20.5g pot -1 ) was observed in treatment T 8 compared to control treatment T 1 . Significant variation over the control was also observed on soil nutrient content like soil OC (%) , total N (%), available phosphorus (ppm) & available sulphur (ppm) content. The result showed that application of shrimp shell powder improves soil pH in both post- harvest soil of first crop and post- harvest soil of residual crop. So, overall result indicated that application of organic material (shrimp shell powder) in soil has significant impact on growth and yield of first crop (radish) and second crop (spinach) and on chemical properties of soil.