Page 11 Advertisements Column 1

Daily Telegraph (Napier), Volume 58, Issue 142, 18 July 1929, Page 11

TflE TRUE VALUE OF ' A FERTILISER j ^EOVTDING- AGAINST DRY SPELLS. Ji" TO INCREASE PRODUCTION. / Although it is now mid-winter and Rainfall is even too abundant, consider- I jPltion must now be given to the provi^ion. of ample pasturage for mid-sum-when short, sharp periods of dry I ffr^tlier are not infrequent. In this ^lonnection it is to be xemembered that plants^ live by drawing from the soil |the water C0H.tain.ing mineral matter in ivery dilute solution. This water passes 4ij> through the plant to the leaves,where Bome of the water and the mineral jnatter is used in the manufaeture of Btarch, sugar and proteins — the foods used by stock. The surplus water not tequired for these purposes passes out of th6 leaves into the atmosphere. This loss of surplus moisture by the plant is termed transpiration. On a fine day a crop of cabbages will transpire as much as two tons of water per acre. Likewise a pasture in mid-summer transpires into the atmosphere very large amounts .©£ water daily. EXPERIMENTS WITH WHEAT. Investigators found that the crops 'JTaTied in the amount of water transpired compared with the amount of dry foodstufi: matter manufattured. This "Sias been termed the transpiration tatio. In. the early '*90 's in South Australia experiments were made with wheat to ascertain the effeet of superphosphate on the transpiration ratio. It was found that whereas with out superphofcphate, wheat required about 1400 parts of water to make 1 part foodstuff; with 6uperphosphate at the rate of 561b. per acre the plants required only about 800 •parts of water. Thus, with a small amount of superphosphate, wheat was tenabled to produce nearly twice as much food as witkout superphosphate for the pame amount of soil water. BUTTERFAT-PRODUCING r PASTURES. The same p'rinciple holds good with ! pastures. Those pastures rcceiving a 'dressing of superphosphate will require less water for each pound of dry food matter manufaetured by the plants. This can be expressed in another way by sayingthat the useof superphosphate as a top-dressing for pastures will result in a greater yield of dry food matter during periods of drought. That this is so was amply demonstrated two seasons ago, when through the somewhat prolonged period of dry weather those pastures top-dressed with superphosphate continued to yield herbage which showed a remarkable capacity for the production of butter-fat.

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