INFLUENCE OF DIFFERENT SOURCES AND LEVELS OF NITROGEN AND ROCK PHOSPHATE ADDITION ON MAIZE PRODUCTIVITY AND SOIL FERTILITY | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 5, Volume 4, Issue 11, November 2013, Page 1313-1328 PDF (519.24 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2013.52903 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| A.M. Abd El-Hafeez; H.A. Awadalla; S.A. Ismail | ||||
| Soil, Water and Environment Res. Inst., A.R.C. | ||||
| Abstract | ||||
| Two field experiments were conducted at Sids Agricultural Research Station Farm during 2010 and 2011 seasons to investigate the effect of two nitrogen fertilizer sources, namely ammonia gas (83% N) and urea (46.5% N) with three levels, i.e. 60, 90 and 120 kg N/fed as well as rock phosphate as phosphorus source under two levels (0.0 and 300 kg rock P/fed) on growth characters ,yield and its components,net income and N, P and K concentrations and uptake of maize (Zea mays L.) as well as soil fertility. The results show that 120 kg N/fed as ammonia gas recorded the highest values of plant height, dry weight/plant, ear length and diameter, 100-seed weight, grain and stover yields, net income, N, P and K concentrations and uptake and nitrogen availability, while number of rows and kernels/ear and P and K availability not affected by either nitrogen sources or levels. Application of rock phosphate significantly increased plant height, dry weight/plant, 100-seed weight, grain and stover yields, net income, N and P concentrations and N, P and K uptake as well as P availability, while ear length and diameter, number of rows and kernels, K concentration and the availability of N and K in soil after harvesting not affected. Phosphorus concentrations in both grains or stover and N and P availability in soil after harvesting were affected by increasing nitrogen levels only under ammonia gas application. | ||||
| Keywords | ||||
| Maize; growth characters; yield and its components; Net income; NPK concentration and uptake; ammonia gas; urea; Soil fertility | ||||
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