ISSN:
1432-1319
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary A field experiment was conducted using a line source sprinkler and corn (Zea mays L.) as an indicator crop to investigate the interactive effects of nitrogen and irrigation on crop yield development, soil water and soil nitrate contents during an irrigated crop season. The harvest index and plant nitrogen contents were also measured. A 4 × 4 × 4 factorial experiment was conducted which included four separate harvests (49, 70, 95 and 117 days after planting) to monitor yield development and nitrogen uptake during the season, four levels (0, 75, 150, and 300 kg/ha) of nitrogen applied as urea, and four levels of irrigation. Statistical analysis showed that dry matter and grain yields and stover nitrogen contents were increased by nitrogen fertilizer, with treatment means for subplots receiving successively higher nitrogen applications significantly different (0.05 level) at successively later stages of the season. Irrigation produced a positive effect on dry matter and grain yields beginning 70 days after planting. The amount of water applied affected the amount of response but not the stage at which it was manifested. Soil water contents were monitored to the 150-cm depth using a neutron probe and soil nitrate contents were monitored by soil sampling to the 120-cm depth. Growth and nitrogen uptake were related to irrigation application and soil water content. Relative nitrogen uptake was related to fertilizer application and soil nitrate contents. Variability in soil nitrate contents prevented nitrogen stress from being predicted from soil nitrate content.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00285553
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