Vegetative-fruiting Development and N Concentrations of a Dwarf Determinate Cotton Cultivar
1976
Wanjura, D. F. | Sunderman, H. D.
The lack of information needed to verify a nitrogen submodel for a cotton (Gossypium hirsutum L.) plant simulation model suggested the need to measure the effect of N level on a broad spectrum of vegetative and fruiting development characteristics in a single field study. The effect on plant N accumulation and growth of O, 90, and 180 kg N/ha applied to Amarillo loam soil, Aridic Paleustalfs, was measured on the cultivar ‘Paymaster Dwarf’ grown in 25 and 100-cm rows. Increasing soil N application rate from O to 90 kg/ha increased per plant dry matter production in 100 but not in 25-cm rows. Application of soil N increased plant N concentrations in leavespetioles-squares and bur fractions. Plant N concentration was unaffected by row spacing. Stem, leaves-petioles-squares, and bur fractions decreased in N concentration from first square to maturity, while seed N concentration increased between peak bloom a/id maturity. The time of fruiting was unaffected by N application rate but there was a trend of increasing per plant square and boll numbers at higher application rates. Peak boll shedding showed two peaks in 25-cm rows where soil N was applied compared to a single peak for 100-cm rows. Collectively, the data describe plant-N status and dry weight at three stages of growth and fruiting weekly for two row spacing and population levels.
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