Tropical maize under pre-anthesis drought and low nitrogen supply
1997
Moser, S. | Feil, B. | Stamp, P. | Thiraporn, R.
An estimated 50 Per cent of tropical lowland maize grown in Southeast Asia is reported to suffer substantial grain yield reduction because of drought stress and low soil fertility. Field trials were conducted in the tropical lowlands of Thailand during the dry season to determine the extent to which water stress and nitrogen limit maize growth and yield. Water stress was established during the vegetative period in combination with three nitrogen fertilization levels. Two hybrids (KTX2602, DK888) and two OPVs (Suwan1, La Posta Sequia) were grown; DK888 and La Posta Sequia were assumed to be relatively drought tolerant. Morpho-physiological traits (including leaf rolling and anthesis-silking interval) were evaluated and biomass accumulation was observed during the vegetative period and at maturity. Shoot and grain were analyzed for nitrogen and mineral element concentrations. Soil water content was measured using time domain reflectrometry (TDR) and tensiometers.
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