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Evaluation of pollination control methods for Pigeonpea (Cajanus cajan (L.) Millsp.) germplasm regeneration

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Author(s): KN Reddy | HD Upadhyaya | LJ Reddy | CLL Gowda

Journal: Journal of SAT Agricultural Research
ISSN 0973-3094

Volume: 2;
Issue: 1;
Start page: 4pp.;
Date: 2006;
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Keywords: seed weight | Cajanus cajan | India | maturation period | regeneration | branches | harvest index | pollination | germplasm | yield components | plant height | Pigeon peas | bagging | flowering date | cost benefit analysis | crop yield | Andhra Pradesh | seeds

ABSTRACT
Two pollination control methods (bagging and under net cages) were compared for cost benefits and for the performance of pigeon pea crop for important agronomic traits: days to 50% flowering, plant height, number of primary and secondary branches, days to 75% maturity, seeds per pod, 100-seed weight, seed yield per plant, harvest index and plot seed yield per hectare. Six accessions of pigeon pea germplasm (ICP 28, ICP 6907, ICP 7057, ICP 8863, ICP 8865 and ICP 11289) belonging to different maturity groups and flowering patterns were sown during the rainy season of 2003/04 in Patancheru, Andhra Pradesh, India. In the bagging method, 2 plants of the same hill were covered with a muslin cloth bag of size 100 x 75 cm after bud initiation but prior to flowering in any accession and the bag was closed tightly at the base of the plants to prevent the entry of insects. Approximately 36 bags were used to cover 72 plants of an accession. As a precautionary measure against insects, plants were sprayedwith appropriate insecticide just before bagging. The other method of pollination control used cages made of prefabricated iron frames of 3 x 3 m size and polypropylene net. Iron frames were fabricated such that they can be conveniently erected and dismantled. The iron frames can be used for 15 seasons or more and the polypropylene net can be used for 5-6 seasons. After bud initiation but prior to flowering in any accession, frames were fixed in the field and several such frames joined together to cover approx equal to 0.5 ha accommodating 550 accessions. These frames were covered with 8 polypropylene net pieces measuring 25 x 25 m each stitched together. The cages were sealed all around with soil at the ground level to prevent the entry of pollinating agents and other insects. Adequate plant protection measures were taken inside the cage. A large number of accessions can be regenerated at a time safely and cost-effectively under cages, even when many accessions to be regenerated belong to the same maturitygroup. Increased seed yield under cage method minimizes the regeneration frequency of accessions, thereby reducing the maintenance costs of total collection in perpetuity.
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