EFFECTS OF IRRIGATION INTERVALS AND NITROGEN LEVELS ON PHYSIOLOGICAL GROWTH PARAMETERS OF RICE (Oryza sativa L.) VARIETIES IN DADIN KOWA, NORTHERN NIGERIA

Authors

  • Y. MUSTAPHA
  • D. T. GUNGULA
  • A. B. MUSTAPHA
  • I. MANU

Keywords:

growth, irrigation, nitrogen, physiology rice, varieties

Abstract

Rice is an important staple food for more than half of the worlds population. Adequate nitrogen and irrigation management practices reduce nitrate leaching and ensure profitable yields. Field experiment were conducted during the dry seasons of 2014/2015, 2015/2016 and 2016/2017 at the Teaching and Research farm of the Federal College of Horticulture, Dadin Kowa, Northern, Nigeria to evaluate the effect of irrigation intervals and nitrogen levels on the physiological growth parameters of rice varieties. The experiment was designed as a 3 x 4 x 3 factorial experiment laid out in split-split plot arrangement replicated three times. The main plot consisted of three irrigation intervals (3, 6 and 9 days); the subplots four nitrogen levels (0, 60, 120 and 180 kg N/ha) while, the sub-sub plot comprised of three rice varieties (Faro 44, Faro 60 and Faro 61). Data collected in various parameters were subjected to analysis of variance (ANOVA) and means were separated using least significant difference at 5% probability level. Results showed that irrigation at every 6 days resulted in significantly higher physiological growth indices than other irrigation intervals. Nitrogen significantly, improved all the physiological parameters. High nitrogen level (180 kg N/ha) resulted in better performance than the control (0 kg N/ha). Varietal differences were also significant for most of the measured parameters. Faro 61 excelled in virtually all the physiological growth parameters while Faro 44 was the least. Nitrogen level and variety interactions indicating that Faro 61-applied 180 kg N/ha had higher values for leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR) and net assimilation rate (NAR). In conclusion, Faro 61-applied 180 kg N/ha and irrigated every 6 days performed optimally in most of the physiological parameters and should be recommended for the farmers in Dadin Kowa, Northern Nigeria

Published

2020-08-04