34t> HORTICULTURE [Bot. Absts. 



2334. Ginarte, Benjamin Munoz. Consideraciones sobre el cultivo de la Pifia en Cuba. 

 [Cultivation of the pineapple in Cuba.] Revist. Agric. Com. y Trab. 2: 370-377. Fig. 8-12. 

 1919. — Continuing from a previous article [See next preceding Entry, 2333.], planting, culti- 

 vating, fertilizing, harvesting, packing and the expenses and receipts of growing pineapples 

 are discussed. — F. M. Blodgett. 



2335. Jensen, C. A. Some relations between citrus fruit growth and soil moisture and 

 climatic conditions. California Citrograph 4: 119, 131. 1919. — A report of investigations 

 carried on at Exeter, Riverside, and Chula Vista, California and at Phoenix, Arizona to de- 

 termine the effect, in the case of light soils, of more frequent irrigations on the rate of growth 

 in volume of lemons. Irrigations with smaller amounts of water at more frequent intervals 

 resulted in an increase in rate of growth from 18 to 27 per cent. In another experiment where 

 the increase in frequency of irrigation applied to the first part of the season only, those with 

 the frequent irrigation reached picking size from 24 to 30 days earlier. The data are pre- 

 sented by means of four graphs. It is emphasized that such differences in growth rates may 

 not be expected on the heavier soil types or near the coast where the transpiration rates are 

 much lower. [See also next following Entry, 2336.] — J. E. Coit. 



2336. Jensen, C. A. Some relations between citrus fruit growth and soil moisture and 

 climatic conditions. Paper No. 2. California Citrograph 4: 184, 188. 1919. — Reasoning 

 from data presented in a previous paper the author suggests that it might be more practic- 

 able for fruit growers to determine when to irrigate by taking measurements of the rate of 

 growth of lemons rather than by soil moisture tests. The reliability of such a method was 

 investigated and 2 graphs are presented to show by correlation coefficients that the amount of 

 available soil moisture is not the only factor affecting growth. Air humidity and tempera- 

 ture are also important factors. Hence the rate of growth of lemons may be used only as an 

 approximate indicator of the soil moisture needs of the trees. [See also next preceding Entry, 

 2335.]— J". E. Coit. 



2337. Kenhardt, Adolf. The cultivation of the custard apple. South African Fruit 

 Grower 6: 203. 2 jig. 1919. 



2338. Kinman, C. F. Observation on frost injury to avocados. Ann. Rept. California 

 Avocado Assoc. 1918-1919:56-58. — Great variation in susceptibility to frost injury noted. 

 In general, most healthy and vigorous trees showed least frost damage. Some varieties of 

 the Mexican type withstood the cold remarkably well, even those trees growing at different 

 points in the Sacramento and Santa Clara valleys. Among varieties especially recom- 

 mended the Fuerte withstood the cold much better than the others. It is pointed out that 

 all kinds are more or less tender while quite young. The degree of hardiness of a new variety 

 cannot be accurately judged until after the tree has come into bearing. — /. E. Coit. 



2339. Knight, E. E. Why are the Guatemalan avocados best? Ann. Rept. California 

 Avocado Assoc. 1918-1919: 31-33. 1 fig. — Committee on varieties has selected 8 out of a total 

 of 158 varieties for recommendation. It is believed that all of these may be displaced with 

 still better varieties when a larger number of the selections introduced from Guatemala will 

 have fruited. Free hand drawing giving approximately the elevation of tablelands from 

 the Rio Grande to the equator. Proceeding southward, no superior avocados are found south 

 of Guatemala until Columbia is reached. Author agrees with Popenoe's estimate of Guate- 

 malan varieties and considers them best because: "The flesh is of a deeper yellow color, 

 smoother, more buttery texture, and richer flavor than any varieties yet known in the United 

 States."— J. E. Coil. 



2340. Lefferts, D. C. Can mulching be recommended as a citrus grove method? Cali- 

 fornia Citrograph 4: 160, 161, 163. 1919. — On a very stiff red clay orchard soil which had 

 gotten into bad physical condition the author tried a heavy mulch applied in basins including 

 somewhat more space than the drip of large orange trees. This system was practised for 5 



