Field investigations were carried out at the Agricultural College and Research Institute, Madurai, India during 1989—1990 to study the genotypic character association in sesame. The F4 and F5 generations of TSS6 X TMV3 and TMV3 X TSS6 were raised and eight genotypic characters were recorded: plant height; primary branches; secondary branches; capsule number per plant; seed number per capsule; 1000 seed—weight; oil content and seed yield per plant. Correlation studies showed that the magnitude and direction of correlation between eight pairs of traits varied with generations in both crosses involving two genotypes reciprocally. Single plant yield had a strong significant and positive relationship with capsule number in both generations of the two cross combinations indicating the close link between the two traits. The path coefficient analysis revealed that direct and indirect contributions by different traits primary branches, secondary branches, capsule number per plant, seed number per capsule and 1000—seed weight had to be considered as the most important traits in the determination of seed yield and selection of parents.
Artificial recharge plays a prominent role in the sustainable management of groundwater resources. The study has proposed a methodology to viable artificial recharge structure using geographical information system (GIS) and empirical equation techniques for augmenting groundwater resources in the Ranchi urban and rural area of Ranchi District, Jharkhand. The thematic layers for geomorphology, drainage density, order of streams, runoff and trend has been prepared in the GIS environment using convection and remote sensing data. It has been found that the slope and topographic gradient of Ranchi region is one of the major governing factors, which restricts to hold surface water stagnant. Jumar watershed is found as the most feasible watershed for the construction of check dams/percolation tanks followed by Lower Subarnarekha watershed. Out of 15 deeper exploratory wells, 14 are declining. Harmu watershed is found to be in the worst condition in terms of availability of runoff water. Harmu, Kanke, Bariyatu, Namkum, Doranda, Hinoo and Hatia have found as the most suitable locations for installation of RTRWH within the Ranchi urban area. Based on the available field information, check dams are suggested as the most promising artificial recharge structures for Ranchi rural environment.
Field experiments were conducted during 1993-95 at Pandit Jawaharlal Nehru College of Agriculture and Research Institute. Karaikal for evolving alternate cropping systems for the Karaikal region of Union Territory of Pondicherry, which is situated at the tail end of Cauvery delta zone. Rice-cotton system was found to be the best system since it outyielded the conventional system (rice-blackgram)) and other cropping systems evaluated (rice-soybean, rice-vegetable cowpea and rice-sesame). The system rice-cotton recorded the maximum gross and net returns followed by rice-vegetable cowpea system. The rice-cotton system may be adopted in areas where water is available for atleast ten irrigations during summer and in areas where water is available for only five irrigations rice-vegetable cowpea system may be economical. Among the four levels of N (0.75. 112.5 or 150 Kg ha) applied to rice, application of 150 Kg N ha increased not only the yield of rice but also the production potential of the system in all the cropping systems studied.
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