Residual effects of different irrigation treatments on the crops grown the succeeding year
1927
Robertson, D.W. | Kezer, A.
The residual effect of previous irrigations showed up on the following Marquis wheat crop. Where water was applied late in the growing season, that is at "heading," "blossoming," or "filling," the following crop was influenced more than where water was applied at "germination," "tillering," or where the plats received a "distributed" irrigation. When the crops of the two years were combined the plats receiving a "distributed" irrigation gave the highest yield of grain and straw. The plats irrigated at "heading" gave the highest yield of the plats receiving a single irrigation of 6 inches. Soil moisture determinations made at the end of the first season showed that more moisture was left in the first 5 feet of soil when the plats were irrigated at "filling" and that the amount decreased with the earlier application. The rainfall during the crop year affected the yield but not the ranking of the different treatments. The succeeding crop grown on the plats irrigated at "filling" gave the highest yield whether the rainfall was 5.64 inches or 23.26 inches.
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