V. Analyses of agricultural yield. Part III. —The influence of natural environmental factors upon the yield of Egyptian cotton

Abstract
The aim of the present communication is to study the operation of various environmental factors in their effects on the yield-curve of Egyptian cotton, as shown in the existing data for analysed yield obtained by the author’s methods. Of such factors we have especially examined the spatial one, and the sowing-date, in Parts I and II, together with the action of a boll-destroying insect. To these factors the present account adds more particular discussion of the effects of soil-fertility (165, 187, 205), of soil-texture, as shown in the effects of a “hard-pan” (165, 184), of soil-depth (193), and shortage of soil-water (167, 169, 199); of the effects of lixiviation of the upper soil by over-watering, and its converse (205); of the effects of weather (174, etc., 185, 188), and of climate (187), the latter being shown by way of soil temperature; of defoliation by leaf-eating insects (174), and finally, of the effects of root-asphyxiation induced by a rise of the water-table (165-175, 191-197, 200, 204, and 207).

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