256 



Journal of Agricultural Research 



Vol. XII, No. s 



24 feet apart. This grove presents the most uniform appearance of any 

 under consideration. The land is practically level, and the soil is appar- 

 ently uniform in texture. The records show a grouping of several low- 

 yielding trees; yet a field observation gives one the impression that the 

 grove as a whole is remarkably uniform. 



SUEDiyiNG WALNUTS. — The walnut-tree records used in the following 

 calculations were obtained during the seasons of 191 5 and 191 6 from a 

 24-year-old Santa Barbara softshell seedling grove, located atWhittier, 

 Cal. The planting is laid out 10 trees wide and 32 trees long, entirely 

 surrounded by additional walnut plantings, except on a part of one 



Fig. 5. — Diagram showing the individual tree yield (in pounds) of the seedling 



walnut orchard. 



North 



Yield per tree {pounds) 



30. 



31- 



32. 



Row. 



172 



164 



74 



122 



120 



160 



170 



95 



6S 



85 



78 



SI 



17 



7S 



117 



83 

 44 

 86 

 71 

 87 

 41 

 86 

 169 

 112 



III 

 135 

 89 

 SO 



lOI 



106 



34 

 104 



69 

 179 

 188 

 122 

 144 

 155 



83 

 176 



SO 

 III 

 136 

 158 

 ISO 

 100 



135 

 96 

 80 



103 

 94 



128 

 71 

 61 



100 



73 

 123 



88 

 103 



69 

 170 

 198 

 125 

 151 

 140 



74 



95 

 151 

 166 



Total yield per row 2,664 3-052 3-037 2,936 2,625 2,849 2)7SS 2,904 2,545 2)689 



113 

 III 

 40 

 80 

 108 

 74 

 135 

 82 

 66 

 195 

 100 

 112 

 71 

 95 

 68 

 35 

 105 

 180 

 124 

 32 

 192 

 130 

 58 

 170 

 54 

 80 

 138 



113 

 35 

 207 

 78 

 112 

 129 

 121 

 93 

 61 

 89 

 72 

 76 

 82 

 57 

 6 

 47 

 65 

 120 

 48 

 142 

 113 

 147 

 112 

 123 

 115 

 75 

 148 

 39 



167 

 3i 

 94 

 57 



118 

 40 



131 

 93 



134 

 45 

 63 

 86 

 99 

 76 

 35 



165 

 197 

 97 

 76 

 119 

 71 

 96 

 99 

 178 

 151 

 192 



87 

 67 

 79 



104 

 80 



123 

 84 

 93 

 61 

 61 



133 

 15 

 15 

 96 

 90 



104 

 91 



144 



122 



lOI 



81 

 210 

 104 

 160 

 130 

 90 

 73 

 157 



207 

 136 

 104 

 144 

 40 

 126 

 72 

 70 

 43 

 14 

 113 

 81 

 69 

 80 

 8s 

 31 

 106 

 77 

 160 

 131 

 113 

 94 

 109 

 87 

 "5 

 94 

 215 



164 

 164 

 195 



S4 



52 

 107 



30 

 8 



60 



25 



73 

 S3 

 28 

 25 

 94 

 42 

 72 

 85 

 117 

 90 

 65 

 149 

 113 

 25 

 166 

 ISO 

 166 

 160 



164 

 164 

 97 

 62 

 58 



96 

 64 

 43 

 loi 

 83 

 50 

 65 

 13 

 75 

 97 

 105 

 83 

 87 

 39 

 131 

 126 

 148 

 129 

 128 

 235 

 201 



Total 

 yield 

 per 

 row. 



1,277 



1, 116 



1,246 



811 



896 



828 



1,016 



970 



771 



677 



842 



815 



612 



629 



603 



858 



914 



1.252 



1,080 



1,117 



1,022 



1.386 



950 



1, 169 



1. 031 



1. 15s 



1.475 



1.538 



28,056 



side which is adjacent to an orange grove. The trees are planted on 

 the square system, 50 feet apart. Figure 5 gives the yield and arrange- 

 ment of these trees. 



Jonathan apples. — ^The apple records ^ were obtained from a lo-year 

 old Jonathan apple orchard located at Providence, Utah. The surface 

 soil of this orchard is very uniform to all appearances except on the 

 extreme eastern edge, where the percentage of gravel increases slightly. 

 The trees are planted 16 feet apart, east and west, and 30 feet apart 

 north and south. Figure 6 gives the yield and arrangement of these trees. 



1 The authors wish hereby to express their appredation of the kindness of the Utah Bxperiment Station 

 in furnishing these records. 



