Coffee (Cofea spp) is one of the most commercially important plantation crops grown worldwide. Coffee occupies a place of pride in international trade next to petroleum. The most important factor that limits the production of coffee is long drought period. Drip fertigation promotes nutrient use efficiency besides ensuring water use efficiency. In recent years, biofertlizers have been found to play a greater role in the integrated nutrient management of crops. The biofertilizers are available in the form of liquid which can be applied through drip fertigation system in a précised manner. The experiment was conducted at Green Pearl Estate at Kottachedu, Yercaud during 2008 and 2009. The investigation was carried out with six year old coffee plants of cv. CHANDRAGIRI. Totally eleven treatments were laid out in a Randomized Block Design and replicated thrice. The results revealed that fertigation and bio fertigation treatments showed significant differences among the growth and yield characters studied. From the results it was observed that the treatment T 9 (Drip fertigaion 75% of NPK RDF + Liquid bio frtilizers) recorded the highest plant height, number of branches per plant, number of nodes per branch, fruit set per cent and yield. It was followed by T 10 (Drip fertigation 100%RDF+Liquid bio fertilizers). Whereas the lowest values for plant height, number of branches per plant, number of nodes per branch, fruit set per cent and yield were recorded by T 1 (absolute control).
SUMMARY :Tomato leaf curl virus disease (TLCVD) is a serious problem in cultivation and production of tomato in India. The disease is widespread in tomato during the summer season in South India and autumn in North India. In South India, the incidence of TLCVD in susceptible cultivars increases rapidly from 27 to 90 per cent causing yield losses exceeding 90 per cent.The objective of this study was to screen the two newly synthesized tomato F 1 hybrids viz., CLN 2123A X HN 2 and HN 2 X CLN 2123A to find out the leaf curl virus resistance along with their parents and check varieties/hybrids. The experiment was conducted both under natural epiphytotic condition as well as glass house condition through whitefly mediated inoculation. The experiment was laid out in a Randomized Block Design and replicated thrice. The results revealed that the newly synthesized hybrids CLN 2123A X HN 2 and HN 2 X CLN 2123A registered low level of percent of disease infection under artificial and natural epiphytotic conditions and these varieties showed high values of defense enzymes viz., peroxidase and poly phenol oxidase both under artificial and natural epiphytotic conditions. The same hybrids also registered higher plant height, number of branches per plant, number of fruits per plant and yield per plant under field condition inferred that these two synthesized hybrids are tolerant tomato leaf curl virus. These two newly synthesized hybrids were on par with tomato leaf curl virus resistant check hybrid Lakshmi for tomato leaf curl virus disease incidence.How to cite this article : Sundharaiya, K., Jansirani, P., Karuthamani, M. and Sathish, G. (2017). Evaluation of tomato hybrids for resistance to leaf curl virus. Agric. Update, 12(TECHSEAR-3) : 777-783;
Afield experiment on Effect of organic manures and biostimulants on growth and seed yield of multiplier onion (Allium cepa var. aggregatum) cv. Co (On 5) was conducted at Agricultural Research Station, Vaigaidam. The experiment was laid out in a Factorial Randomized Block Design with two factors viz., organic manures and biostimulants which includes M1- Control, M2- FYM (12.5 t ha-1), M3- Neem cake (2 t ha-1) and M4- Vermicompost (2 t ha-1) and S1- Control (water spray), S2- Humic acid (0.2 %), S3- Panchagavya (2%), S4- Vermiwash (2%) and S5- Seaweed extract (2%). Totally twenty treatments and were replicated thrice. The results revealed that soil application of FYM @ 12.5 t ha-1 recorded higher plant growth bulb yield and seed yield when compared to other organic manures of the present study. Similarly among the bio stimulants 2 per cent seaweed extract spray recorded higher plant growth, bulb yield and seed yield when compared to other bio stimulants of the present study. Interaction effect also showed that soil application of FYM @ 12.5 t ha-1 and foliar application of seaweed extract excelled and recoded the maximum plant growth, bulb yield and seed yield in multiplier onion.
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