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Articles by Ezekiel Akinkunmi Akinrinde
Total Records ( 3 ) for Ezekiel Akinkunmi Akinrinde
  Ezekiel Akinkunmi Akinrinde
  Little information is available on control of lodging, particularly when early-maturing, high-yielding, tall rice (Oryza sativa L.) varieties are heavily fertilized with nitrogen (N). Two plant growth regulators, PGRs-chlormequat (applied at 30 mg pot-1) and ancymidol (applied at 1.5 mg pot-1) were tested on two rice cultivars (early maturing, tall 0S-6 and late maturing, dwarf IR-5) after treatment to three N rates (0, 2.5 and 45 mg N kg-1) in an effort to evaluate PGRs and N effects on rice crop performance and N-use efficiency (NUE). Significant (p<0.5) responses to N-treatment were obtained with respect to plant height and tiller count. Number of fertile tillers increased, resulting in higher grain yields. At crop half (1/2) -life, N effect was generally insignificant on plant height but IR5 tillers increased while PGRs reduced height of both rice varieties but failed to dwarf them at maturity (full life). At full life, N application increased numbers of tillers, parnicles, spikelets and grains as well as weights of panicles, straw and grains; OS6 plants were taller than the control while IR5 plant heights were not affected just as panicle lengths remained the same. The NUE by OS6 plants increased with increase in N application rate but reduced in IR5 plants. Only OS6 had its grain yield increased by the PGRs. Increased plant heights caused more lodging in the early maturing variety (OS-6) despite the application of the PGRs, implying the inadequacy of PGRs rates sprayed on the plants while PGRs/N interactions were insignificant.
  Ezekiel Akinkunmi Akinrinde and Akeem Babatunde Lawal
  In this study, the effectiveness of sole and combined fertiliser treatments of organic fertilisers, O.F (Dinos, 24 mg Zn kg-1; Pacesetter, 190 mg Zn kg-1) and different PRs, (Sokoto rock phosphate-SRP, Ogun RP and crystalliser) for sweet corn performance was evaluated in a slightly acid (pH 6.6) Alfisol and another medium acid (5.9) Alfisol in southwestern Nigeria. Sixteen fertilizer treatment combinations (applied to the test crop) were replicated three times in completely randomised design to give a total of 96 experimental units for the two soils. Treated soils were also incubated for 7 and 28 day(s) prior to determination of changes in pH, available P and extractable Zn. Analyses of short-term and residual effects of the fertilizer treatments indicated better crop performance in the slightly acid (1.40-2.63 g biomass pot-1) than in the medium acid soil (0.57-0.88 g biomass pot-1). Maximum yield and optimum P and Zn nutrition were obtained from combined application of PRs and O.F. Without OF, P and/or Zn applications reduced uptake of Zn by the crop. For sustainable production of the crop on the soils, PRs should be applied in combination with OF as P release from them is improved and Zn toxicity ameliorated.
  Ezekiel Akinkunmi Akinrinde and Gabriel Olufemi Obigbesan
  Paucity of research information on the agronomic effectiveness of Nigerian phosphate rocks had until recently hindered their direct application by farmers. We have investigated the behaviour of some indigenous phosphate rocks (Ogun Phosphate Rock, ORP and Sokoto Phosphate Rock, SRP) under laboratory; greenhouse and field plot conditions. Their physico-chemical and mineralogical properties as well as phosphate release in strongly acidic and mildly acid soil types and different moisture regimes were determined. Their suitability for direct application as phosphorus (P) fertilizer for maize (Zea mays), millet (Pennisetum glaucum) and oil palm (Elaeis guineesis) seedlings were tested in comparison with single super phosphate. Here, their agronomic efficiency in field studies at selected agro-ecological zones and soil types is reviewed. The results of chemical and crystallographic tests revealed the carbonate fluorapatite nature, the high total P content (ORP = 30.50% P2O5; SRP = 32.5% P2O5) and their soil ameliorating (liming) potential (ORP = 19.2% CaO; SRP = 44.2% CaO). ORP and SRP are reactive phosphate rocks, since more than 30% of P content are soluble in 2% citric acid. Unlike SRP with low Fe2SO4 and Al2O3 contents, ORP by virtue of its high Al and Fe oxides (6.9 and 7.3%) might be less suitable for partial acidulation. The chelating effect of the admixture of ground rock phosphate with poultry manure facilitated the solubilization of rock P and resulted into higher agronomic effectiveness. The results showed that SRP and ORP could be conveniently used for direct application in the humid and sub-humid zones with rainfall above 1200 mm. Low rainfall of semi-arid zone would be inadequate for their solubilization.
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