The present investigation was carried out at the Horticulture Nursery, College of agriculture, Rewa M.P. during rabi season 2017-18. To find out the N-level and plant spacing interactions in tomato under protected cultivation. The treatments consisted of 12 combinations of 4 levels of nitrogen (0, 60, 80 and 100 kg/ha) and 3 levels of plant spacing (60 45 cm and 60  55 cm) and were laid out in randomized block design with 3 replications. The best interaction was the widest (60  55 cm) spacing with 100 kg N/ha for all the characters under study. The treatment interactions where found to the significant in case all the growth parameters.

The field experiment was conducted at the Horticulture Instructional farm, JNKVV, College of Agriculture, Rewa (M.P.) during Rabi, 2018-19. The experiment consists of twelve treatment combinations with bio-fertilizers and mulch in Randomized Block Design. The best result found that application of T12 (Black polythene + Azotobacter + PSB) with significantly superior over rest of the treatments. The concerning curd diameter 16.02 cm fresh plant weight 1247.7 g, primary curd weight 425.5 g, secondary curd weight 284.8 g, yield per ha 227.5 q. The maximum net return (465054 Rs/ha) and B:C ratio (4.5) were obtained in treatment twelve (T12) followed by T8 (426604 Rs/ha). Whereas the highest B: C ratio 5.03 was recorded in T8 (Rice straw + PSB + Azotobacter) treatments due to less treatment cost as compared to other treatment.

The compatibility and effectiveness of Wetcit surfactant using as spray tank mix with insecticide formulations against mites (Polyphagotarsonemus latus) on Chilli crop was evaluated. The treatments were taken as Propargite 57% EC @ 1500 ml/ha, Emamectin benzoate 5% SG @ 200 g/ha and Buprofezin 25% SC @ 300 ml/ha alone, and as tank mix with Wetcit @ 500 ml/ha at their lower dose rate 1350 ml/ha, 180 g/ha and 270 ml/ha, respectively. Wetcit alone @ 500 ml/ha and untreated control (water alone) treatments were also taken for comparison. The mite population recorded at 5, 10 and 15 days after each spray showed that Wetcit used with insecticidal formulations resulted in low mite population than sole insecticidal treatments (without mixing with surfactant). Thus Wetcit @ 500 ml/ha used with Propargite 57% EC @ 1350 and 1500 ml/ha, Emamectin benzoate 5% SG @ 180 and 200 g/ha and Buprofezin 25% SC @ 200 and 300 ml/ha resulted to be effective with low mite population at each observation time and increased chilli fruit yield. No phytotoxicity to chilli crop was observed at each observation time. Thus, Wetcit surfactant was compatible with tested insecticide formulations and enhanced their effectiveness against mites in chilli crop.