Browsing by Author "Jose Abraham"
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Item Effect of climatic factors on Phytophthora leaf infection in black pepper grown in arecanut-black pepper mixed cropping system(2007-02-08) Ramachandran, N.; Sarma, Y.R.; Anandaraj, M.; Jose AbrahamEffect of climatic factors on the occurrence of foliar infection in black pepper caused by Phytophthora palmivora MF4 was studied during the years 1984-86 in arecanut-black pepper mixed cropping system. The correlation studies between the disease recorded at weekly intervals and the meteorological factors prevailing during the preceding seven days showed a positive correlation between the rainfall, number of rainy days and relative humidity whereas temperature and sunshine hours had a negative correlation. Average climatic factors worked out during increasing and decreasing phases of the disease showed that factors such as low temperature (22.7-29.6°C), shorter duration of sunshine (2.8-3.5 h/day) high rainfall (15.8-23.Omm/day) and high relative humidity (81-99%) contributed to the increase n disease.Item Effect of zinc and molybdenum on root (wilt) affected coconut palms(2007-02-08) Mathew, A.S.; Jose, A.I.; Jose Abraham; Robert Cecil, S.; Kamalakshi Amma, P.G.Item Effect of zinc and molybdenum on root (wilt) affected coconut palms(1986) Mathew, A.S.; Jose, A.I.; Jose Abraham; Robert Cecil, S.; Kamalakshi Amma, P.G.Item Norms for Release of Larval, Prepupal and Pupal Parasitoids of Opislna Arenosella Wlk., the Leaf Eating Caterpillar of the Coconut Palm(1987-12) Sathiamma, B.; Pillai, G.B.; Jose Abraham; Keshava Bhat, S.; Jayapal, S.P.; Ramachandran Nair, K.An experiment was conducted to work out the dosages for release of the larval, prepupal and pupal parasitoids of Opisina arenosella under field conditions. Parasite releases were madeat three doses Viz. Zero, 25 and SOX of the target stages of the pest population at fortnightly intervals. Observations revealed that the releases of the parasites effected varying levels of reduction in population density of O. arenosella. The reduction obtained was significant in plots in which the larval parasitoid Goniozus nephantidis and the prepupal parasitoid Elasmus nephantidis were released. The doses worked out were 20.5% for G. nephantidis, 49.4X for E. nephantidis and 31.9% for B. nosatoi, when the parasitoids were released individually, and 40.4% when a combined release was made.Item Studies on Water Uptake by Root(Wilt) Diseased Coconut Palms(1986) Rajagopal, V.; Chacko Mathew; Patil, K.D.; Jose AbrahamInvestigations were carried out to study the uptake of water by the roots of apparently healthy and root (wilt) - affected coconut palms (Cocos nucifera L.). Feeding the cut end of roots with water indicated that diseased palms have lesser uptake than the healthy palms. Irrigating the palms during summer had beneficial effect on water uptake through roots of different maturity and by roots of healthy and diseased palms. Estimation of soil moisture content at different profiles in the basins of apparently healthy and diseased palms at one day interval for five days after irrigation indicated that the former" had greater depletion of water than the latter. These results show that the root system of diseased palms is adversely affected.Item Studies On Water Uptake By Root(Wilt) Diseased Coconut Palms(1986) Rajagopal, V.; Chacko Mathew; Patil, K.D.; Jose AbrahamInvestigations were carried out to study the uptake of water by the roots of apparently healthy and root (wilt) - affected coconut palms (Cocos nucifera L.). Feeding the cut end of roots with water indicated that diseased palms have lesser uptake than the healthy palms. Irrigating the palms during summer had beneficial effect on water uptake through roots of different maturity and by roots of healthy and diseased palms. Estimation of soil moisture content at different profiles in the basins of apparently healthy and diseased palms at one day interval for five days after irrigation indicated that the former" had greater depletion of water than the latter. These results show that the root system of diseased palms is adversely affected.Item A Technique For Estimating Yield In Black Pepper (Piper Nigrum L.)(1986-12) Balakrishnan, R.; Jose AbrahamA technique for visually scoring for yield of pepper plants was standardised. It was found that yield of pepper plants could be estimated with a high R2 value (R2 = 0.81) using visual yield score as a predictor variable. It was established that by using visual yield score as an ancillary variable in a double sampling scheme, the cost of yield estimation could be reduced by half in comparison to that of simple random sampling for estimating the yield of pepper plantations with a given accuracy. The technique for visually scoring for yield of pepper was field tested and it was found that the method could be adopted with very minimum training to the investigators.Item Trend In Yield Of Root (Wilt) Affected Coconut Palms (Cocos Nucifera Linn.)(1987) Jose Abraham; Rawther, T.S.S.; Jacob, P.M.; Robert CecilCorrelation and regression studies were carried out on yield and disease index of root (wilt) affected coconut palms. The significant negative correlations obtained between, yield and disease index revealed the debilitating impact of the disease on yield. Regression equations fitted on data collected from 500 palms aged above 30 years in the farmers field showed an average reduction of O.S nuts per index while it was 1.3 nuts per index for the younger palms (aged below 13 years) under the well managed farm conditions. This indicates that the impact of disease is more in the case of palms which contract disease during the early years of bearing. However, the average yield of the palms under the well managed conditions were consistantly high upto the index level of 50 points, showing the effect of good management on maintaining the yield.Item Trend in Yield of Root (Wilt) Affected Coconut Palms (Cocos Nucifera Linn.)(1987) Jose Abraham; Rawther, T.S.S.; Jacob, P.M.; Robert CecilCorrelation and regression studies were carried out on yield and disease index of root (wilt) affected coconut palms. The significant negative correlations obtained between, yield and disease index revealed the debilitating impact of the disease on yield. Regression equations fitted on data collected from 500 palms aged above 30 years in the farmers field showed an average reduction of O.S nuts per index while it was 1.3 nuts per index for the younger palms (aged below 13 years) under the well managed farm conditions. This indicates that the impact of disease is more in the case of palms which contract disease during the early years of bearing. However, the average yield of the palms under the well managed conditions were consistantly high upto the index level of 50 points, showing the effect of good management on maintaining the yield.Item Uniformity Trials : Optimum Size And Shape Of Plots And Blocks In Experiments With Cashew(1991) George, M.V.; Amarnath, C.H.; Jose AbrahamUniformity trials in cashew (airlayers) were laid out is the existing cashew estates at Periya, Kasaragod district, belonging to the Plantation Corporation of Kerala. The yield data from 288 trees (24 rows of 12 trees each) were collected for two year 1982-83 and 198344 by daily harvest Fair field Smiths Law Y = ax and Its generalisation y=ac-s1 where g s stand for the heterogeneity coefficients expressing the reiationship between plot size (x) in r rows of c column and the C. V. (Y) of yield were tried Graphical method and maximum curvature technique were used for working out the optimum plot size. Further the cost of experimentation per treatment to estimate the means at 10% S E. was worked out for different price situations. A plot size or 6 rows of 2 trees each forming the plot across the fertility lines was found to be the optimum for experiments with cashew.