19191 FIELD CROPS. 337 



able tubers. Skips of more than one hill iire deemed to be a total loss except 

 for 4G.4 per cent of the yield of one plant. 



The number of tubers per plant was 20.7 per cent greater for the exterior than 

 for the interior plants, and the tubers were larger on the average. The ex- 

 terior plants produced on the average 5.6 marketable tubers, and the interior 

 plants 4.7. 



In all, 30 pairs of plants entering into the experiment were severely affected 

 with leaf roll, and the influence of this factor on the results is discussed. It is 

 stated that although the leaf roll plants were small, they did not have the 

 effect of missing hill.s. 



In the check rows, the differences in total yield between the different pairs of 

 seed pieces i-anged from to 66.7 per cent of the mean yield of the two plants, 

 the average difference being 20.7 ])er cent. Such wide differences are held to 

 indicate that certain factors exist which have an important bearing on the 

 yield of potatoes that are either unknown or underestimated. 



Recognizing that the loss from missing hills probably varies considerably 

 with the variety, the distance between hills, the character and fertility of the 

 soil and cultural and lueteorological conditions, a modification of the fornuila 

 frequently used to obtain the so-called corrected yield to plat experiments with 

 potatoes is deemed justified by the results of this experiment, whereby the esti- 

 mated stand will be replaced by "stand value," the correct formula being 



CY= , ' ynlue ' ^^^ stand value is to be calculated by means of the 



nv-0AQ4:S 

 formula SV=1 ~ ' in which m is the number of the missing hills per 



acre, s the number of skips or series of consecutive missing hills per acre, and n 

 the number of hills per acre in a full stand. 



Handling^ and loading southern new potatoes, A. M. Grimes (U. S. Dept. 

 Agr., Farmers' Bui. 1050 {1919), pp. 18, figs. 18). — Factors contributing to loss 

 in transit and in the ruarket of southern new potatoes are outlined and methods 

 of handling, packing, and loading the crop to minimize such losses described. 

 Field cuts and bruises and exposure to the sun after digging are said to occasion 

 considerable loss, together with improper methods of loading which permit 

 shifting and breakage in transit. Double-headed barrels are said to be the most 

 satisfactory container, while it is suggested that in loading provision be made 

 for a maximum amount of ventilation throughout the load and for the preven- 

 tion of shifting. 



Rhodes grass, S. M. Teacy (U. S. Dept. Agr., Farmers' Bui. 1048 {1919), pp. 

 14^ fiffs. 3). — The history and adaptation of Rhodes grass {Chloris gayana) are 

 ■discussed, and field practices employed in growing and handling the crop both 

 for hay and pasture are described. Proximate analyses are included. 



Elite culture and multiplication of some standard Ilocano and Tagalog 

 lowland rices, L. M. Romeko {Philippine Agr., 7 {1918), No. 5, pp. H9-15S). — 

 In a continuation of wcn-k previously noted (E. S. R., 40, p. 336), the author 

 describes the further propagation and multiplication of the best strains of 

 Ilocano and Tagalog lowland rice secured through selection at Los Bafios, P. I. 



Saving man labor in sugar beet fields, L. A. Moorhouse and T. H. Sum- 

 mers {U. S. Dept. Agr., Farmers' Bui. IO42 {1919), pp. IS, figs. 26).— Labor- 

 saving devices employed in the preparation of the soil, the cultivation and har- 

 vesting of the crop, and hauling the crop to the factory are described and illus- 

 trated for several important sugar beet areas in the United States. 



Bud variations in sugar cane, C. S. Pomekoy {Jour. Heredity, 10 {1919), No. 

 3, pp. 129-135, figs. 2). — The author discusses briefly the bud origin of several 

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