1919] FIELD CROPS. 643 



rows 18, 24, 30, and 36 in. apart with the plants spaced 9, 12, 15, and 18 in. 

 apart in the row for each planting distance. 



The best spacing for the variety employed (Arran Chief) was found to be 

 from 24 to 30 in. between rows and 15 in. between plants. In comparative 

 tests of locally-grown seed potatoes with seed from Scotland and Ireland the 

 local seed gave quite favorable results. It is stated that while all the factors 

 making for maximum yields of potatoes are not yet known the source of the 

 seed is a most Important one. 



Potato production, G. Stewabt {Utah Sta. Circ. 40 {1919), pp. 3-54, fiQS. 

 20). — This comprises a general discussion of cultural methods and field prac- 

 tices employed in growing the potato crop in Utah, with notes on storing and 

 marketing the product. 



[Keport of work with potatoes in the Rhine Province], T. Remy {Verof- 

 fentl. Landw. Kammer Rhcinprov., No. 2 {1919), pp. 96, pis. 14). — This describes 

 variety, cultural, and fertilizer tests with potatoes conducted during 1918. 



A study of the relation of climatic conditions to the vegetative growth. 

 and seed production of rice, F. de Pekalta y Leano {Pliilippine Agr., 7 {1919), 

 No. 6, pp. 159-183, figs. 4)- — In an effort to study the correlation between vege- 

 tative growth and seed production in the rice plant and climatic conditions 

 prevailing in the Philippines, plats of Inlntiw lowland rice were started every 

 four weeks during the period of April, 1916, to April, 1917, at Los Banos, and 

 observations made on climatic and water conditions and on the growth and 

 seed production of the plants at regular intervals throughout the experiment. 

 The cultural methods were the same as those usually employed in the locality. 

 The data are presented in tabular form, fully discussed, and depicted graphi- 

 cally. The conclusions reached may be summarized as follows : 



Rice exhibited an annual vegetative growth and flowering cycle, the period 

 required to attain maturity ranging from 104 to 174 days in the Inlntiw 

 variety. The maximum yields of grain were secured from plantings made in 

 April, May, and June, while the yields decreased markedly up to the October 

 seeding, increasing again with the November seeding. No definite ratio be- 

 tween the grain and straw was observed, although it was noted that the grain 

 Increased in weight with an increase in straw. 



The maximum growth occurred during the period of highest total evapora- 

 tion and the minimum growth with the least total evaporation. The yield of 

 grain Increased with an increase in the length of the panicle. The height 

 of the plants was less during a season of low evaporation and greater during 

 a season of high evaporation. A correlation was observed to exist between 

 the yield of grain and the height of the plant, tall plants being accompanied 

 by high yields. The grain yield was highest during the season of high evapora- 

 tion and lowest during the season of low evaporation. The longer the period 

 required to attain maturity the greater was the leaf area produced. Low tem- 

 perature during the first month of growth appeared to induce early maturity 

 In rice. Rice seed kept in a closed vessel at a constant temperature of about 

 27.5° C. (81.5° F.) was appreciably reduced in vitality within a year. 



Rice [in Tucuman], F. W. M. Raben {Bol. Min. Agr. [Argentina^, 22 {1917), 

 No. 2, pp. 149-171). — Observations on growing the crop In Tucumtln are pre- 

 sented, together with notes on field tests of Valencia and Japanese rices. 



South Bali [Dutcli East Indies] and its rice culture, K. van deb Veeb 

 {Teysmannia, 29 {1918), No. 7, pp. 367-388, pis. 2).— This comprises a general 

 description of the rice industry on the Island of Bali. 



The place of rye in American agriculture, C. E. Leighty {U. 8. Dept. Agr. 

 Yearbook 1918, pp. 169-184). — The marked increase in rye production In the 



