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District-Bastar (Chhattisgarh). The soil of experimental site was sandy loam; it was low in organic carbon (0.44%) and available nitrogen (235.15 kg ha -1 ) and medium in available phosphorus (13.10 kg ha -1 ) and potassium (291.33 kg ha -1 ) and acidic in reaction (6.2 pH). The experiment was laid out in spilt plot design with three crop residue management practices and four varieties of wheat. Three residue management practices viz. Residue burnt + tillage (T 1 ), Residue incorporation (T 2 ) and Residue retention (T 3 ), were applied in main plot and four varieties viz. GW-273 (V 1 ), Lok-1 (V 2 ), Kanchan (V 3 ) and Sujata (V 4 ) in sub-plot and replicated 3 times. The results revealed that treatment residue retention recorded relatively higher plant height (16.90 cm) at 15 DAS, whereas treatment residue incorporation recorded relatively higher plant height ( 26.42 cm) at 30 DAS, (57.51 cm) at 45 DAS and (75.09 cm) at 60 DAS, (93.28 cm) at 75 DAS, (96.74 cm) at 90 DAS and (97.28 cm) at harvest. The varieties GW-273 recorded significantly higher plant height (17.66 cm) at 15 DAS and (26.81 cm) at 30 DAS, variety LOk-1 recorded significantly higher plant height (62.77 cm and 78.24 cm) at (45 and 60 DAS) respectively. Significantly higher plant height recorded of variety Sujata (113.04 cm) at 75 DAS, (113.51 cm) at 90 DAS and (114.06 cm) at harvest. Treatment residue retention recorded relatively higher number of tillers (427.92) at 15 DAS, whereas treatment residue incorporation recorded relatively higher number of tillers (693.75) at 30 DAS, (862.50) at 45 DAS, (618.75) at 60 DAS, (549.08) at 75 DAS, (545.67) at 90 DAS and (544.92) at harvest. The varieties Sujata recorded significantly higher number of tillers (749.44), (901.11) and ( 652.22) at 30, 45 and 60 DAS respectively, whereas variety Lok-1 recorded significantly higher number of tillers (577.22), (577.00) and (576.44) at 75 DAS, 90 DAS and at harvest respectively. The days to occurrence of crop growth stages more influenced due to varieties and less influenced due to crop residue management practices. Treatment residue incorporation recorded relatively higher grain yield (40.63 q ha -1 ), straw yield (32.92 q ha -1 ) and gross return (Rs. ha -1 64,541), whereas treatment residue retention recorded highest net return. (Rs. ha -1 39,308) and B: C ratio (Rs. 2.81). Varieties Lok-1 recorded significantly higher grain yield (43.36 q ha -1 ), harvest index (61.35%), gross return (Rs. ha -1 66,130), net return (Rs. ha -1 41,452) and B: C ratio (Rs. 2.68). Variety Sujata produces significantly higher straw yield (34.83 q ha -1 ).

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Colocasia (Colocasia esculenta L. Schott) is one of the important tuber crops grown for fresh and processing purpose all over the India due to its wider adaptability under various agro-climatic conditions, which plays a major role in supplementing the income of small and marginal farmer of the Kanker district of Chhattisgarh state. The present study was carried out at Kanker district during kharif 2015-16 and 2016-17. Front line demonstrations were conducted on colocasia by the active participation of the farmers with the objective of improved technologies of colocasia production potential. The improved technologies consist improved variety (Indira Arvi-1), balanced fertilizers (Soil test based) application and integrated pest and disease management, etc. The development of the agriculture is primarily depends on the application of the scientific technologies by making the best use of available resources. One of the major constraints of traditional colocasia farming is low productivity because of non-adoption of advanced technologies like improved varieties. To increase the production, productivity and quality of agricultural produce, front line demonstrations are being conducted at various farmer's field. All the recommended practices were provided to the selected farmers. The data related to the cost of cultivation, production, productivity, gross return and net return were collected as per schedule and analyzed. Result of the present study revealed that higher average yield in the demonstrations was recorded (205.5 q ha -1 ) as compared to farmers practice (159 q ha -1 ) traditionally adopted by the farmers. The percentage increase in the yield over farmer's practice 29.24 was recorded. The technology gap and extension gap were computed 14.5 and 46.5 q ha -1 respectively, along with 6.59 per cent of technology index. The demonstrated field gave higher average net return Rs. 89500 and B:C ratio is 1: 2.19. The result of the study indicated the gap existed in the potential yield and demonstration yield is due to soil fertility and weather conditions. Present results clearly show that the yield and economics of tomato can be boost up by adopting recommended technologies.