. Efficient use of annual plants on cattle ranges in the California foothills . 42- 43- 44- '43 '44 '45 GROWING SEASON Figure 13.—Estimated total production of air-dn^ herbage per grazable acre, and total precipitation during plant growing season (September of one year to time of plant maturity in next year), San Joaquin Experimental Range, 1935-48. In years with precipitation greater than 20 inches, the heavy rainfall during the winter months was largely lost by seepage from the upper soil before air temperatures became favorable for plant growth. Shallow- rooted annuals could not take advant
. Efficient use of annual plants on cattle ranges in the California foothills . 42- 43- 44- '43 '44 '45 GROWING SEASON Figure 13.—Estimated total production of air-dn^ herbage per grazable acre, and total precipitation during plant growing season (September of one year to time of plant maturity in next year), San Joaquin Experimental Range, 1935-48. In years with precipitation greater than 20 inches, the heavy rainfall during the winter months was largely lost by seepage from the upper soil before air temperatures became favorable for plant growth. Shallow- rooted annuals could not take advantage of the excess precipitation except on bottom-land soils, where ample seepage from the slopes pro- vided moisture into the spring months. Thus, total herbage production was approximately average in four of the six seasons when total precipita- tion was above 20 inches. Greater than average yields were obtained during 1937-38, with inches of precipitation, when good rains oc-
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