Advances in Agronomy, Vol. 1 by A.G. Norman (ed.)

By A.G. Norman (ed.)

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NO,, but they set no more bolls. In the foregoing experiment there was much floral bud shedding under low light and much boll shedding under high light. An important but as yet unanswered question arises from this experiment: If carbohydrate deficiency is a general cause of boll shedding why were the supplies found in the high light plants not more nearly utilized before these plants started to shed? Any satisfactory explanation of the cause of boll shedding on nutritional grounds will evidently need to go beyond the often repeated carbohydrate and nitrogen theory.

6. Root-Knot Root-knot caused by Heterodera marioni (Cornu) Goodey was early recognized by Gilbert (1914) as a serious disease of cotton in itself, and also as a contributing factor to the losses in wilt-infested soils, due to the fact that Fusarium wilt of cotton is much more severe where the disease is associated with root-knot. Godfrey (1923, 1943) recommends clean fallow, rotation with nonsusceptible crops, and summer plowing for controlling root-knot. Watson and Goff (1937) and Watson (1945) in Florida, reported control by use of mulches.

I n addition to controlling pre-emergence and post-emergence dampingoff, these materials will disinfect the surface of the seed and eliminate seed-borne diseases such as bacterial blight and anthracnose. 2. Phymatotrichum Root Rot The first systematic work on the cause and control of cotton root rot was done by Pammel (1888, 1889). Various causes for the disease were suggested, such as certain chemical or physical conditions of the soil, an excess of humic acid, an excess of lime, an excess of sulfuric acid, insufficient drainage, or an impervious stratum of clay or limestone underlying the plants that arrested the growth of the taproots.

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