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Effect of Water Regime and Fertilization on Barley Growth, Water Use, and N and P Uptake¹

Barley (Hordeum vulgare L.) grown on two soils in controlled light-temperature environment was watered only at predetermined levels of soil water suction and fertilized to several levels with N and P. Yields and soil and fertilizer P absorption were reduced on treatments with high moisture suctions at the time the soil was rewatered. The reduction in uptake was greater for soil P than for fertilizer P. Thus, increasing the maximum soil suction increased the relative absorption of fertilizer P by barley on both soils. Increasing the maximum soil suction did not affect the total N absorbed by the plants. Water use, dry matter produced from each unit of water consumed, and N and P absorption were increased by fertilization. On Gardena loam, the yields from the 40- and 80-ppm N treatments were reduced appreciably by 6 bars suction. However, at the zero N level, there was little growth reduction at 6 bars. At 19 bars suction, the growth was reduced on all fertilizer treatments. Within each N level, P generally increased yields similarly on both soils at suctions of 7 bars or less. For each moisture treatment, fertilizer additions increased dry matter. Water use increased in a like manner.

² Soil Scientists, USDA, Mandan, North Dakota, and Ithaca, New York, respectively.

Received for publication March 18, 1966.