No. 3, December, 1920] AGRONOMY 131 



897. Smith, J. Wabebn. Effect of snow on winter wheat in Ohio. Monthly Weather Rev. 

 47: 701-702. 1 fig. 1919. — The relation of snow cover to the yield of wheal is not a direct 

 one. Snow in itself, if above the normal late in the year, may be detrimi atal, but it is of 

 great value during periods of unseasonable temperature by preventing frost-heaving of soil 

 when freezing and thawing conditions prevail. — E. N. Munns. 



898. Syme, J. E. Farmers' experiment plots. Winter fodders, Western District, 1919. 

 Agric. Gaz. New South Wales 31 : 315-317. 1920. — Report of trials by six farmers with miscel- 

 laneous forage crops for pasture, with records of the carrying capacity. — C. V. Piper. 



899. Vendrell. Ernesto. Estudios sobre los abonos verdes en rotacion con las demas 

 plantas cultivadas en Cuba. III. [Green manures in rotation with other plants in Cuba. III.] 

 Revist. Agric. Com. y Trab. 3: 71-74, 112-115. 1920. 



900. Vornemann, Prof. Dr. Die Kohlenstoffernahrung der Kulturpflanzen. [The car- 

 bon dioxide assimilation of cultivated plants.] Mitteil. Deutsch. Landw. Ges. 35: 302-303. 

 1920. — This is a semi-popular paper setting forth especially the value of the C0 2 that is devel- 

 oped in the soil by the decay of organic matter and reaches the surface below the leaves of the 

 growing crop. The practical conclusion is reached, that manure or green manure should be 

 so applied as to produce the maximum decay during the height of the growing season. The 

 value of tillage consists partly in encouraging the evolution of carbon dioxide. — A. J. Pieters. 



901. Waldron, J. W., A. Gartley, C. R. Hemenway, J. N. S. Williams, G. P. Wilcox, 

 T. H. Petrie, and H. P. Agee. Report of Committee in Charge of the Experiment Station. 

 Rept. Exp. Sta. Hawaiian Sugar Planters' Assoc, for 1919. 49 p. 1920. — Discussion of cer- 

 tain fungus and insect enemies of sugar cane, together with reports as to progress of investi- 

 gations concerning the fertilizer requirements of cane, refining qualities of commercial sugar, 

 utilization of molasses, sugar-cane breeding work, and methods of cultivation. — J. M. 

 Westgate. 



902. Wenholz, H. Broom millet seed as feed for stock. Agric. Gaz. New South Wales 

 31: 305-307. 1920. — Broom millet seed of good quality is a comparatively cheap feed for 

 poultry, and, if fed judicially, for horses, sheep, cattle and pigs. The most serious drawback 

 is the difficulty of storage. The three essentials for safe storage are, (1) quick reduction of 

 moisture content, (2) good ventilation and (3) well-cleaned seed free from dirt. Grinding 

 of the seed before feeding is advisable, except for sheep and poultry; soaking improves the 

 feed for pigs. — C. V. Piper. 



903. Willcox, Sir William. The Sudd Reservoir or Nature's provision of perennial 

 irrigation and flood protection for the whole of the Nile valley. Bull. Inst. d'Egypte 1 : 35-69. 

 1919. — The author treats the problem under seven headings, which are discussed in order. 

 The total profitably cultivable area of Egypt is given as 6,663,000 acres of which 1,312,000 acres 

 are uncultivated. Of the area cultivated, 4,064,000 acres are under perennial irrigation (a 

 continuous water supply) and 1,287,000 acres are under basin irrigation (covered with water 

 only once a year when the Nile is in flood). For the whole of Egypt, the water required annu- 

 ally for the irrigation of lands now cultivated amounts to 9,000,000,000 cubic meters. When 

 all of the available land is cultivated, 13,500,000,000 cu. m. will be required. To irrigate 

 500,000 acres in the Sudan, 3,750,000,000 cu. m. of water will be required annually. Since 

 only 5,500,000,000 cu. m. are naturally available, there will be a deficit of 11,500,000,000 cu. m. 

 The present net capacity of Aswan reservoir is 2,000,000,000 cu. m., leaving 8,500,000,000 

 cu. m. to be provided by additional works. To furnish additional water, the author recom- 

 mends that the natural storage in the Sudd region of the White Nile be drawn upon, and 

 describes the various projects necessary to accomplish this. Another storage reservoir could 

 also be formed by the construction of a barrage on the Saubat (Sabat) river at a point above 

 Nassar. This reservoir is designed to furnish the 3,750,000,000 cu. m. of water needed for the 

 Sudan. By raising the Aswan dam, its storage capacity could be increased to 4,000,000,000 



