Agronomic and economic evaluation of garlic (Allium sativum L.) and corn intercropping as influenced by tillage and planting time of corn (Zea mays L.)
1988
Marcos, L.B.
Agronomic characters and yield and yield components of garlic were not significantly affected by methods of tillage except for leaf area at the early vegetative stage (21 DAP). Plant height, grade index, and yield components (diameter, length, weight per bulb, number of cloves per bulb, and bulb yield) were significantly affected by time of intercropping corn. Bulb size, bulb weight, grade index, and number of cloves per bulb were increased by delaying the time of planting corn. Monoculture had significantly higher bulb yield. Tillage method did not significantly affect yield and yield components of corn. However, time of intercropping significantly affected yield components of corn. Highest net benefit was derived from intercropping corn at 44 DAPG [days after planting garlic] under minimum tillage followed by intercropping corn at 33 DAPG under intensive tillage. Based on the marginal rate of return, one can invest in intercropping corn in garlic at 44 DAPG under minimum tillage (T2IT4) and intercropping corn at 22 DAPG under the same tillage method (T2IT2). Both monoculture and intercropped corn were attacked by cutworms (Spodoptera litura (Fabr.)), semi-loopers (Chrysodeixis chalcites (Esper)), corn borers (Ostrinia furnacalis (Guenee)), and earworms (Holicoverpa armigera (Hubn.)) suggesting that other crop combination did not offer an effective pest control. Garlic was not seriously attacked by the leaf folder (Homona coffearia (Nietn.)). The insect was observed in relatively few plants of the monoculture and intercropping plots.
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