The balanced use of fertilizer play vital role to maintain required nutrients level in the plants for their better growth. Currently, most of the fertilizer addition is carried out using manual broadcasting that reduces the fertilizer use efficiency due to non-uniform fertilizer distribution. Moreover, the excessive use of fertilizer not only results fertilizer wastage but also affect output quality of produce along with environmental pollution. Thus, in order to address these serious concerns and to increase fertilizer use efficiency, this research study was carried out for the development and testing of walk behind granular fertilizer applicator. The development of the applicator was carried out using locally available materials to reduce its capital cost. The performance evaluation of fertilizer applicator was carried out under laboratory and actual field conditions to determine various parameters like application rate, fertilizer missing index, fertilizer droppage rate, wheel slippage and field efficiency. The results showed that the average fertilizer rate for maize and cotton crop was found to be 69.17 and 157.05 kg/ha respectively. The fertilizer missing index was found to be zero. The average theoretical and effective field capacity was found to be 0.245 and 0.197 ha/h respectively with an average field efficiency of 81.52%. The average wheel slippage was calculated to be 8.78%.

The aim of present study was to evaluate the selected germplasm against chili leaf curl virus disease (ChiLCVD) and its management through nutrients. The chili varieties i.e., Zinia F1, Desi (Jalalpuri), Desi (Jalalpuri 2), Wonder Hot, Summer Queen F1 and Faisalabad Selection was evaluated against the ChiLCVD. After screening, Wonder Hot and Summer Queen F1 showed moderately resistant (MR) response whereas, 3 varieties i.e., Zinia F1, Desi (Jalalpuri) and Desi (Jalalpuri 2) had a moderately susceptible (MS) response and only a single variety (Faisalabad Selection) expressed resistant (R) response. Four varieties; Desi (Jalalpuri), Desi (Jalalpuri 2), Zinia F1 and Wonder Hot, were used for management experiment with 4 nutrients combinations, T1 (ZnSO4 + CuSO4), T2 (MnSO4 + CuSO4), T3 (Boric Acid + CuSO4) and T4 (ZnSO4 + CuSO4 + MnSO4 + Boric Acid). When compared to control (58.14%), only T4 demonstrated minimum disease severity (11.63%). In case of disease incidence, T4 gave the best results with minimum disease incidence (35.65%) as compared to control (92.59%). Treatments reduced disease progression even during favorable environmental conditions. There was significant (p?0.05) but positive correlation between wind speed and disease severity. Wind speed was highly correlated with the disease severity of variety Wonder Hot (r=0.91). It could be concluded that the application of nutrients activates the plant defense system and at suppress the vector infestation. Keywords: Management, Nutrients, Whitefly, Epidemiology.