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Nitrogen use efficiency of some Zimbabwean dwarf and Zambian maize hybrids using N (15) methods

By: Mwale, M | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Manyowa, N.M [coaut.] | Mapiki, A [coaut.] | Munyinda, K [coaut.] | Phiri, L.K [coaut.] | Waddington, S.R.|Murwira, H.K.|Kumwenda, J.D.T.|Hikwa, D.|Tagwira, F [eds.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Harare (Zimbabwe) Soil Fert Net|CIMMYT : 1998ISBN: 970-648-006-4.Subject(s): Biomass AGROVOC | Fertilizers | Nutrient uptake | Zambia | Zimbabwe | CIMMYT | Soil Fert Net | Zea mays AGROVOC | Soil fertility AGROVOC | Yields AGROVOC | Nitrogen fertilizers AGROVOC | Hybrids AGROVOCDDC classification: 631.45 Summary: Field and green house experiments were conducted at Mt. Makulu and Magoye Research Stations in the 1995/96 and 1996/97 seasons. The objective of the study was to quantify the nitrogen use efficiency of some Zimbabwean dwarf hybrids and Zambian normal maize (Zea mays L.) hybrids by the 15N methodology. In the first season, six Zimbabwean dwarf (ACFD951 - 956) and three Zambian (GV 408, 507 and 607) pre-released maize hybrids were evaluated. Four rates of urea-N were applied at 0, 40, 80, 120 kg N ha-1 with 1.83% atom excess 15N applied only at Magoye at 80 kg N ha-1. Subsequently a pot experiment with seven Zimbabwean dwarf hybrids (ACFD961 - 967) and two Zambian normal hybrids (GV 607 and 408) was planted. Two grammes 15N was applied at 5% atom excess to 3 kg soil per pot. In 1996/97 season, five dwarf hybrids (ACFD 3351-261, 3351-225, 797725, 797754 and 21-244) and the same three Zambian hybrids were planted. Nitrogen was applied at 0, 50, 100 and 150 kg N ha-1 with 1.83% atom excess 15N applied at 100 kg N ha-1 in both locations. Field experiments were harvested at physiological maturity while the pot study was harvested at 60 days after planting and analysed for total N and the isotope ratio. All the rates and hybrids tested were different within a location at the 5% level of significance in both seasons. The highest yield was obtained from ACFD956 with 9 t ha-1 at Mt. Makulu in 1995/96 season. The percent N derived from fertilizer (% Ndff) ranged from 21 - 56% and 73 - 84% in the field and pot experiments, respectively. This was probably due to greater mineralization-immobilization turnover in the field. Some N could also have been lost in the field due to leaching and denitrification. The fertilizer N utilisation ranged from 9 - 25% for the Zambian hybrids and 11 - 30 % for the Zimbabwean hybrids, although the differences were not significant (P=0.05) within location. These results show that in terms of yield and fertilizer use efficiency the dwarf hybrids compete well with the Zambian normal hybrids.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 631.45 WAD (Browse shelf) 1 Available 1C628739
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Field and green house experiments were conducted at Mt. Makulu and Magoye Research Stations in the 1995/96 and 1996/97 seasons. The objective of the study was to quantify the nitrogen use efficiency of some Zimbabwean dwarf hybrids and Zambian normal maize (Zea mays L.) hybrids by the 15N methodology. In the first season, six Zimbabwean dwarf (ACFD951 - 956) and three Zambian (GV 408, 507 and 607) pre-released maize hybrids were evaluated. Four rates of urea-N were applied at 0, 40, 80, 120 kg N ha-1 with 1.83% atom excess 15N applied only at Magoye at 80 kg N ha-1. Subsequently a pot experiment with seven Zimbabwean dwarf hybrids (ACFD961 - 967) and two Zambian normal hybrids (GV 607 and 408) was planted. Two grammes 15N was applied at 5% atom excess to 3 kg soil per pot. In 1996/97 season, five dwarf hybrids (ACFD 3351-261, 3351-225, 797725, 797754 and 21-244) and the same three Zambian hybrids were planted. Nitrogen was applied at 0, 50, 100 and 150 kg N ha-1 with 1.83% atom excess 15N applied at 100 kg N ha-1 in both locations. Field experiments were harvested at physiological maturity while the pot study was harvested at 60 days after planting and analysed for total N and the isotope ratio. All the rates and hybrids tested were different within a location at the 5% level of significance in both seasons. The highest yield was obtained from ACFD956 with 9 t ha-1 at Mt. Makulu in 1995/96 season. The percent N derived from fertilizer (% Ndff) ranged from 21 - 56% and 73 - 84% in the field and pot experiments, respectively. This was probably due to greater mineralization-immobilization turnover in the field. Some N could also have been lost in the field due to leaching and denitrification. The fertilizer N utilisation ranged from 9 - 25% for the Zambian hybrids and 11 - 30 % for the Zimbabwean hybrids, although the differences were not significant (P=0.05) within location. These results show that in terms of yield and fertilizer use efficiency the dwarf hybrids compete well with the Zambian normal hybrids.

English

9907|AGRIS 9902|R98-99ANALY

Jose Juan Caballero

CIMMYT Publications Collection

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