Response of low-nitrogen tolerant maize genotypes to nitrogen application in a tropical Alfisol in northern Nigeria

• Published in: Soil & tillage research Vol. 91; no. 1; pp. 181 - 185
• Main Authors: Azeez, J.O., Adetunji, M.T., Lagoke, S.T.O.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-12-2006; Elsevier
• Subjects: Agronomy. Soil science and plant productions; Alfisols; arid soils; arid zones; Biological and medical sciences; corn; crop production; crop yield; fertilizer application; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; genetic variation; genotype; grain yield; Low-N tolerant maize; nitrogen; Nitrogen application; Nitrogen, phosphorus, potassium fertilizations; savanna soils; savannas; soil; soil fertility; Soil science; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Tropical Alfisol; tropical soils; Zea mays; Nigeria; West Africa; Sub-Saharan Africa; Africa; Low-N tolerant maize; Tropical Alfisol; Nitrogen application; Nitrogen fertilization; Monocotyledones; Zea mays; Tropical zone; Alfisols; Tolerance; Genotype; Nitrogen; Cereal crop; Soils; Gramineae; Angiospermae; Spermatophyta; Soil science
• ISSN: 0167-1987; 1879-3444
• DOI: 10.1016/j.still.2005.12.002

In the dry savannas of west and central Africa, where low soil fertility is major constraint to maize production, the development of tropical maize genotypes with high and stable yield under low-nitrogen condition is very important, since access to these improved genotypes may be the only affordable alternative to many small scale farmers.
Field trials were conducted at Samaru (Typic Haplustalfs) to investigate the response of low-N tolerant maize cultivars to nitrogen (N) fertilizer. Nitrogen application rates were 0, 30, 60, 90
kg
N
ha
−1 and four maize cultivars (Low-N pool C2, ACR 8328 BN C7, Super Oba II and TZR-SR). Maize leaf area index, intercepted radiation, leaf area and stover weights were increased due to nitrogen application at flowering. For most of the parameters, 60
kg
N
ha
−1 appeared to have the significantly high values. However, there was no significant difference between application rates of 60 and 90
kg
N
ha
−1 in stem weight, stover weight, grain yield and shelling percent at harvest. Genotypic variation observed in the maize agronomic traits were not significant except in leaf weight and grain yield. The amount of nitrogen taken by maize increased with increase in fertilizer rates. Application of 30 and 90
kg
N
ha
−1 to soil increased the maize grain N concentration and total N uptake. About 45.3
kg
ha
−1 and 8.8
g
N
kg
−1 nitrogen uptake was obtained in maize shoot and grain, respectively, at the application of 90
kg
N
ha
−1. Low-N pool C2 genotype had the highest grain N concentration and shoot uptake significantly higher than TZB-SR. Nitrogen fertilizer applied accounted for 97% variation in soil nitrate. There existed a positive and significant correlation between maize grain yield and leaf nitrogen uptake (
r
=
0.33,
P
<
0.01). Averagely, nitrogen fertilizer applied accounted for 86% variations in maize grain yield.