Industrial Crops
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Browsing Industrial Crops by Subject "Acidity"
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Item Effect of Acidity and Cation Content of nutrient Supply on Yield of Pyrethrum (Chrysanthemum Cinerariaefolium)(1971) Pinkerton, A.An acid medium, pH 5 to 6, was necessary for pyrethrum to attain maximum yield in sand culture. The lower the pH, the greater the concentration of calcium. required for maximum yield. The critical level of calcium was about 30 per cent of the total cations, i.e. somewhat higher than for other crops. Plants supplied with low rates of calcium (1.6 to 3.2 m-equiv. per litre) were stimulated to flower earlier than plants supplied with higher rates, but soon died. Variations in acidity and calcium supply led to greater differences in yield during the first period of picking than during the second flush of flowering, and thus these factors are most important during establishment of the crop.Item Notes on Conditions Influencing Quality in Coffee(1936) Trench, A. D.At the present time it is of paramount importance to the coffee planter to produce a marketable coffee, and such coffee must have "quality" in order to compete with mild coffees from other countries.Item The Root-System of Sisal in Some East African Soils(1939) Glover, J.; East African Agricultural Research Station, Amani, Tanganyika TerritoryDuring 1937-38 a field investigation was made of the root-system of sisal in relation to some typical soils on which it is grown in East Africa. The root-systems of the plants were excavated by means of water jets provided by a powerful motor-driven pump. A vertical sector of the root-system was obtained by washing away the soil from the roots in the vertical face of a trench extending from the base of the plant to a distance of ten or more feet away. As a check the whole root-system of several plants was excavated, and it was found that the trench isector method gave a reliable indication of the whole. Hand excavation was resorted to if the water method failed owing to the hardness of the soil. -As-the roots were exposed they were pegged in position and drawn to scale with the aid of a string grid of one foot squares. After preliminary trials on plants of various ages, those of the age group 4+ to 5+ years were chosen as having attained their maximum development. In one area, plants of twenty years of age were investigated. Plants were chosen us good specimens for their locality. They had all reached a height of 5 ft. above ground, except on certain poor soils (Nos. 2 and 6). The field spacing in all cases was 2.5 metres x 1 metre. They had all been cleaned twice annually by cutlassing the weeds between the rows.
