Field trials were conducted at the Research Farm of the University of Ado Ekiti, Ado Ekiti, Ekiti State in the forest zone of the South Western Nigeria. The aims were to evaluate the effects of cultivars and rates of NPK (15-15-15) fertilizer on the dry matter distribution in maize (Zea mays L.). Commercial NPK (15-15-15) fertilizer at rates of 0,250, 500 and 750Kg/ha representing 0,37.50, 75.00 and 90.00 Kg/ha was applied to three varieties of maize (DMRESR-Y, SUWAN-Y and DMRLSR-Y). Results showed that dry matter distribution/ partitioning varied among plant parts and growth stages. Accumulation of dry matter in maize was therefore significantly higher in the leaf than the stem in the early growth stages (4 and 6 WAP) but conversely larger in the stem than the leaf in the reproductive growth stages (8. 10 and 12 WAP) of maize. Similarly dry matter accumulation in maize was larger in the ear than the leaf. Maize ear also accumulated significantly higher dry matter than the stem at 12WAP. There were also significant cultivar differences in the accumulation of dry matter in maize. Maize cultivar DMRLSRY-Y accumulated the largest dry matter, followed by SUWAN-Y and lowest in DMRESR-Y in most growth stages in the two years of study. Dry matter accumulation in maize also increased linearly with the increasing NPK (15-15-15) fertilizer rates. Grain yield followed the pattern of dry matter accumulation in the three maize cultivars. Grain yield was highest in DMRLR-Y followed by SUWAN-Y and lowest in DMRESR-Y. Grain yield also increased with the increasing rates of NPK (15-15-15) up till 500Kg/ha and thereafter stabilized or formed a plateau.
PAPER TITLE :INFLUENCE OF CULTIVAR AND RATES OF NPK (15-15-15) FERTILIZER ON DRY MATTER DISTRIBUTION OF MAIZE
APPLIED TROPICAL AGRICULTURE | VOLUME 18 NUMBER 1 2013
- Author(s) : A.A. Adeyemi