Rt esponse of Cotton to Boron
1971
Murphy, B. C. | Lancaster, J. D.
Field experiments were conducted with rates and methods of application of B to cotton. Broadcast was as effective as drilled, foliar application was as good as soil application, and there was no advantage to a combination of soil and foliar application. A highly soluble source of B was superior to a more slowly soluble one. Young leaves, the third or fourth node from the growing point, were found to have a critical level of about 15 ppm B. Mature leaves occurring at the fifth and sixth nodes from the growing point had a B content of 5 to 10 ppm higher. The critical level of hot-water soluble B in the top 15 cm of soil was in the range of 0.10 to 0.16 ppm.
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