Improvement of seed production practices for promising green manures for rice
1993
De Dios, J.L. | Sta Cruz, P.C. | Obien, S.R. (Philippine Rice Research Inst., Munoz, Nueva Ecija (Philippines))
The seed production capability of Aeschynomene afraspera and Sesbania rostrata were evaluated under varying planting time and establishment methods. Transplanting stems (TS), row seeding (RS), and broadcast seeding (BS) were evaluated at PhilRice, Maligaya [Nueva Ecija, Philippines]. A. afraspera gave good seed yield when planted in September using TS (592 kg/ha) and RS (759 kg/ha). However, BS method had good seed yield (712 kg/ha) when planted in October. On the other hand, S. rostrata had good seed yield in September planting with seed yields of 344, 726, and 896 kg/ha in the TS, RS, and BS, respectively. The results show that the best time of planting these legumes for seed production purposes is September to October. The seed yields of the two legumes decreased when planting was done towards January. Planting from January to June for seed production purposes is impractical due to their photoperiod reaction. Among the planting methods, TS can be used under waterlogged condition, while RS and BS can be used under drained condition. The management of BS was better than RS and TS during planting, but weeding and harvesting of seeds was earlier in RS and TS. TS flowered earlier than BS and RS and harvested 20-40 days ahead. For about 30-40 kg seeds intended for a hectare green manure biomass, an area for seed production should be allocated. For A. afraspera, about 600-900 sq.m. if TS and about 450-600 sq.m. if RS or BS. For S. rostrata, about 1000-1300 sq.m. if TS and 400-850 sq.m. if BS or RS. The three establishment methods are technically feasible but their applicability depend on field conditions and farm resources present
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