118 AGRONOMY [BoT. Absts., Vol. VIII, 



802. Opazo, Roberto. Siembras de trigo. [Planting wheat.] EI Agricultor [Santiago, 

 Chile] S: 70-73. 1920. — A general discussion of wheat growing in Chile, including soil types, 

 manner of sowing, fertilizers used, and cultivation methods. — John A. Stevenson. 



803. Pitt, J. M. Farmers' experiment plots. Summer fodder experiments, 1919-20. 

 Central coast. Agric. Gaz. New South Wales 31 : 805-808. 1 fig. 1920. — In cooperation with 

 farmers, trials were conducted with Sudan grass, sachaline, Planter's Friend sorghum, and 

 Japanese millet. The maximum yield, 36 tons of green fodder per acre, was secured from 

 sachaline, plants attaining a height of 13 feet. Sudan grass grew 8 feet in 11 weeks. — L. R. 

 Waldron. 



804. Phidham, J. T. Varieties of wheat tested in New South Wales. Agric. Gaz. New 

 South Wales 32 : 10-19. 1921. — A total of 249 varieties of wheat are listed, including 59 dupli- 

 cates. Notes are given as to season, utilization, character of grain, origin, adaptations, 

 defects, good points, and distinguishing characters. — L. R. Waldron. 



805. QuEREAU, F. C. The amount of salt in irrigation water injurious to rice. Louisiana 

 Agric. Exp. Sta. Bull. 171. J4 V-, ^ fiQ- 1920. — Irrigation water is liable to contain salt dur- 

 ing periods of drought. Pot and field experiments show that water containing 35 grains or 

 more of salt to the gallon is liable to be injurious to rice. — C. W. Edgerton. 



806. QuEREAU, F. C. Rice investigations. Louisiana Agric. Exp. Sta. Bull. 172. 87 p., 

 35 fig. 1920. — This bulletin discusses the various investigations that have been carried on 

 with rice in the rice belt of Louisiana. In the fertilizer experiments, the best results were 

 obtained with fertilizers that contained phosphoric acid. Potash does not seem to be neces- 

 sary. — The rotation experiments showed that short rotations are not profitable, due to the 

 high overhead expense necessitated by the change from rice to highland crops. The rotation 

 recommended is 5-7 years in rice followed by the same period in other crops. — Red rice is one 

 of the most important difficulties of the rice farmer. Methods for controlling red rice include 

 rotation, use of cover crops, and pasturage. Crude oil has been found useful in controlling 

 the root maggot. The principal rice diseases are rotten neck or blast {Piricularia oryzae) 

 and straight head. The rotten neck disease occurs both in young and old plants. The 

 straight head is most common on ground that produced a crop other than rice the preceding 

 year. Straight head rarely develops in fields that have been drained during the season. — 

 The best methods of growing, fertilizing, and harvesting rice are given. The estimated 

 cost of growing an acre of rice in 1910 was $27.26, while in 1917-1918 it was $31.95.— C. W. 

 Edgerton. 



807. RiNDL, M. Vegetable fats and oils. IV, and V. Semi-drying oils. South African 

 Jour. Indust. 3 : 518-531, 742-749. 1920. 



808. Rios, P. Gonzalez. La produccion de nuevas variedades de cana. [The production 

 of new cane varieties.] Sugar 21: 218-221. S fig. 1919. — Discusses the production of sugar 

 cane seed and the growing of sugar cane seedlings.- — C. W. Edgerton. 



809. Roberts, Herbert F. The relation of protein content to variety types in American 

 wheat. Jour. Agric. Sci. 10: 121-134. 1920. — Author reviews and analyzes several papers 

 on the protein content of American wheat and its relation to variety and climate. A short 

 and comparatively dry growing season, especially in spring in the case of winter wheat, favors 

 the development of grain high in protein content. Water supply is the most important factor 

 in determining the starch-protein ratio. Higher rainfall or a greater amount of irrigation 

 water increases the proportion of starch in wheat. The protein content of wheat increases 

 from east to west with the exception of the Pacific Coast region, which in general produces 

 wheat lowest in proteins. There is considerable variation in the starch-protein ratio within 

 definite varieties. Mediterranean durums are highest, Russian durums are next, and bread 

 wheats are lowest in protein content. In given regions the variation in protein content for 



