Effect of plant density and harvest date of corn on yield of sweet potato in a corn-sweet potato intercropping
1989
Morales, A.C. | Carangal, V.R. (International Rice Research Inst., Los Banos, Laguna (Philippines). Rice Farming Systems Program)
A field trial of corn and sweet potato in monoculture and in association was conducted at IRRI [International Rice Research Inst., Los Banos, Laguna, Philippines] Farm during the 1985-86 dry season. Corn variety (IPB Var I) was planted at densities of 26, 33, 44 and 53 T plants/ha in intercrop and at 53 T plants/ha both in monoculture. Sweet potato (Var Kinabakab) was planted at 53 T plants/ha both in monoculture and intercrop. Both crops were established on the same date. Corn was harvested at 40, 60, 80 days after planting at full maturity. Sweet potato was harvested 120 days after planting. Sweet potato roots and fodder yield significantly decreased from the monocrop level with increasing density and delayed harvest date of corn intercrop beyond 40 days of association. However, no significant decrease in weight and number of marketable roots were observed at 26 and 33 T plants/ha of corn intercrop which suggest that corn-sweet potato association of these densities can still be allowed up to 40 days after establishment of sweet potato to have additional fodder for livestock. Grain yield of corn significantly decreased with sweet potato intercropping. The highest grain yield (3.2 t/ha) of corn in association with sweet potato was obtained at 44 T plants/ha. Corn monoculture yielded 4.48 t/ha. Marketable green ear yield at 80 days corn harvest date was highest (5.35 t/ha) at 57 T plants/ha. Fresh fodder and fodder dry matter yields increased with increasing corn plant densities and delayed harvesting of corn up to 60 days after planting.
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