Influence of nitrogen fertilization on mono or mixed cultures of Echinochloa colona (L.) Link and cotton
1993
Bilgera, B.U. | Manuel, J.S. (Cotton Research and Development Inst., Batac, Ilocos Norte (Philippines))
Increased height, leaf production, nitrogen content, and seed output of Echinochloa colona were observed as nitrogen level was increased from 35 to 105 kg/ha. E. colona plants that grew with cotton were shorter; produced shorter panicles, fewer tillers, panicles, spikes and seeds; and exhibited earlier tillering, flowering and panicle production than in monoculture. Height of cotton, number and weight of bolls produced also increased at high levels of nitrogen. Boll production was reduced by 54.5% when E. colona competed with the crop for the whole season. Crop yield reduction was due to decreased nitrogen content, shorter cotton plants with fewer and smaller bolls. Significant interaction of nitrogen levels and culture occurred on leaf production at 47 and 54 DAS, plant height from 19 to 54 DAS [days after sowing], on tiller and panicle production, panicle length, number of seeds per spike of E. colona and boll production and nitrogen content of cotton.
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