. Proceedings of the American Society of Agronomy . percent hasgreatly increased the production of both grain and straw. It is quite interesting to notice the very favorable efifects which thelater applications of fertilizers have produced, especially as regardsgrain, as compared with fertilizing at the time of planting. In bothlow and high moisture soils the complete fertilizer produced a heavieryield of grain when applied at the second and third stages than whenapplied at the time of planting. The results are somewhat differentwith the straw, the yield on the high moisture soil decreasin
. Proceedings of the American Society of Agronomy . percent hasgreatly increased the production of both grain and straw. It is quite interesting to notice the very favorable efifects which thelater applications of fertilizers have produced, especially as regardsgrain, as compared with fertilizing at the time of planting. In bothlow and high moisture soils the complete fertilizer produced a heavieryield of grain when applied at the second and third stages than whenapplied at the time of planting. The results are somewhat differentwith the straw, the yield on the high moisture soil decreasing as theperiod of growth at which the fertilizer treatments were given ad-vances. However, there was a higher yield of straw on the lowmoisture soil from the pots fertilized at the second stage than fromthose fertilized at planting. Where fertilization was given to the low MORGAN : AVAILABILITY OF PLANT NUTRIENTS. 243 moisture soil at the third stage, the yield of straw dropped below theother fertilized pots but was higher than the untreated Fig. 30.—Yield, in grams, of grain (wheat) under varying conditions of soilmoisture and fertilization. The high nitrogen fertilizer, when applied to the low moisture soilat the second stage of growth, has not produced as high a yield ofeither grain or straw as when applied at planting. However, whenthis same fertilizer was applied to the high moisture soil at the second 244 PROCEEDINGS OF THE AMERICAN SOCIETY OF AGRONOMY. stage, the yield of grain and straw was higher than when appHed atplanting. (See Figs. 30 and 31.)
Size: 1180px × 2118px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherwashingtondcthesoc
