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Water and nutrient crop sufficiency models for potato, wheat, canola, oats, alfalfa, and corn.

Khakbazan, M., Hamilton, C., Mohr, R.M., and Grant, C.A. (2011). "Water and nutrient crop sufficiency models for potato, wheat, canola, oats, alfalfa, and corn.", The Americas Journal of Plant Science and Biotechnology, 5(Spec. Issue 2), pp. 45-60.

Abstract

Crop water and nutrient efficiency is very important for optimal economic and environmental productivity. Functional models relating crop yields to water and nutrient requirements are integral to many modeling studies forecasting climate change impacts on crop production and environmental footprints. The objective of this paper was to collect data, and identify or develop statistical models relating water and nutrient requirements to yield for some major crops grown in western Canada through a review of studies conducted in the Great Plains. Statistical models developed to predict water, nitrogen, and phosphorus rates for potato, wheat, canola, oats, alfalfa, and corns were reviewed and compared in terms of optimal yield achievements. Water and nutrient requirements depend on crop species, and varies among regions and models. Based on statistical models reviewed or developed in this study, the optimal growing season water requirement for wheat, oats, canola, alfalfa, and corn was 350, 450, 350, 500-600, and 425 mm, respectively. Average water use of potato for Manitoba was in the range of 375 to 400 mm but could go as high as 696 mm. Optimal nitrogen sufficiency for potato was reported to be 200 kg N ha-1. Nitrogen requirements for wheat, oats, canola, alfalfa, and corn were 105, 100-110, 150-220, 0 or 35-55, and 160 kg N ha-1, respectively. Optimal phosphorus sufficiency for potato was reported to be about 50 kg P ha-1 for Manitoba. Phosphorus sufficiency for wheat, oats, canola, alfalfa, and corn were about 15-50, 25-29, 26-36, 36-60, and 33-64 kg P ha-1.

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