19201 HORTICULTURE. G47 



whole problem of hieimial and annual hcarini,' appears to he affected to a de- 

 <iree by the sterility and i»ollinalion pi()l)leni and is not one of j^rowtli and 

 nutrition only. 



There appears to be a good correlation between the weight of the indi- 

 vidual apph's produced on a tree and the weight of seeds in each fruit. Since 

 the nuniin-r of good seeds and weight of seeds are correlated, it is suggested that 

 the correlation would probably hold between weight of fiuit and number of good 

 seeds. Such factors as temperature, wind, sunshine, etc., exert a marked in- 

 (luence through their effect on the length of the blooming period, light and bee 

 activity, on the number of good seeds, and the weight of seeds in individual 

 ai)ples on a tree. With the same crops per tree and with cultural practices 

 favorable to good vigorous spur growth, the size of the individual apples of a 

 tree should be larger in those seasons which have good weather at pollination 

 time. Although the correlation between weight of seeds and weight of in- 

 dividual api)les holds true for any particular season, a large Crop per tree in 

 any particular season is conducive to smaller frtiit. 



Growth and yield of ai)i)le trees, N. L. Partridge (Proc. Amer. Soc. Hort. 

 Set., 16 {1919), pp. 104-109, Jigs. 8).— A contribution from the Delaware Experi- 

 ment Station comprising a preliminary report on some of the results secured 

 in the station's experimental apple orchard. 



The orchard in question has now completed its tenth season's growth and 

 has produced fruit in six seasons. Curves are given showing the growth and 

 yield of the .Tonathan, Yellow Transparent, and Stayman Winesap trees dur- 

 ing the seasons of 1917-19, inclusive, together with the growth and yield of 

 some individual Stayman Winesap trees. Observations thus far made indi- 

 cate that the trees have fallen into three natural classes: Those which have 

 a tendency to bear heavier in the odd year than in the even ; those which have 

 a tendency to bear more in the even year than in the odd ; and those which 

 have, generally speaking, made a consistent increase in yield each year but 

 with no consistent biennial tendency indicated. 



The growth made the previous year is more significant in relation to the 

 current year's yield than is the growth made during the current year. In other 

 words, there appears to be an alternate habit of growth as well as an alternate 

 habit of bearing in the trees. 



Orchard rejuvenation in southeastern Ohio, F. H. Ballou and I. P. Lewis 

 (Ohio Sta. Bui. 339 (1920), pp. 3-42, figs. 20).— This comprises the final report 

 on the station's orchard rejuvenation work in southeastern Ohio (E. S. H., 

 36, p. 40). It deals particularly with the results secured during a 5-year 

 period in two exi)erimental orchards. 



The work in one of these orchards comprised a comparison of the grass- 

 mulch and tillage-cover crop methods of culture combiued with a test of com- 

 I)lete and incomplete fertilization. The cost of cultural work in the grass- 

 mulch section averaged $2.65 per acre per year as compared with $17.09 per 

 acre per year in the tillage-cover crop section. Under uniform fertilization 

 throughout both sections the grass-mulch system gave an average gain of 1.9 

 bbls. of apples or a cash gain of .$20.52 per acre per year over the tillage- 

 cover crop .system. Unfertilized plats under tillage and cover cropping gave 

 an average gain of 15.6 bbls. of apples, or a ca.sh gain of $35.48 over the un- 

 fertilized plats in the grass-mulch section. It is pointed out that these latter 

 plats remained in their former state of neglect with the exception of spray- 

 ing. Grass-mulch culture plus fertilization with quickly available nitrogenous 

 plant food gave an average gain of 22.2 bbls. of apples, or a net cash gain of 

 $71.48 per acre per year over the tillage-cover crop .system without fertiliza- 

 tion. The cost of the grass-mulch method of orchard culture, jtlus fertiliza- 



