Feb., 1926] PROGRESS OF AGRICULTURAL EXPERIMENTS 27 



results which have been published by other experiment stations. It is 

 probable that still greater increases would be obtained from the use of 

 larger applications of this fertilizer. 



In two different parts of the experiment, plots which receive muriate 

 of potash show a somewhat higher yield than adjoining plots which are 

 otherwise under similar treatment. Thus, Plot 2, which receives muriate 

 of potash in addition to nitrate of soda, has an average yield of nearly 58 

 pounds per tree more than Plot 1, which receives nitrate of soda only. 

 This increase is nearly five times the probable error of the difference as 

 calculated from the variations in yield on the individual trees. Similai'ly, 

 Plot 5 differs from Plot 4 simply by the addition of one pound of muriate 

 of potash per tree. The increased yield in this case is 18.7 ±9.1 pounds 

 per tree. In this case, the difference is hardly great enough to be con- 

 sidered significant, considering the variation between different trees. 

 On the whole, these results with potash may be considered to be suggestive 

 but by no means conclusive. They are strikingly similar to results pub- 

 lished by the Delaware Experiment Station where, — exactly as in this 

 case, — there was an increased yield on the plots receiving potash, al- 

 though the increase was hardly great enough to be conclusive. 



The plots receiving acid phosphate appear to give a decreased yield. 

 Thus, Plot 4 differs from Plot 1 only in that it receives in addition three 

 pounds acid phosphate per tree, yet the yield is some 25 pounds per 

 tree less. Plot 5 differs from Plot 2 merely by the addition of acid phos- 

 phate, and the 3aeld in this case is 14 pounds per tree less. However, 

 Plots 4 and 5 are both situated at one side of the field, and Plots 1 and 2 

 are located at the other. Therefore, the comparison of the respective 

 plots which receive acid phosphate with those which do not receive it, is 

 not believed to be reliable. 



Acid Phosphate on Squash {Hatch Fund) 



During the latter part of May the acid phosphate fertilizer plots previ- 

 ously used for tomatoes were planted to squash by J. R. Hepler. These 

 plots are 20 x 34, and twelve hills of squash were planted on each. They 

 were thinned to three plants per hill, but owing to subsequent attack of 

 fusarium disease the number of plants per hill was not absolutely uniform. 



The treatments were as follows : . 



Treatment 1. Plats 1, 9, 17 and 25 — 40 tons of manure per acre. 

 Treatment 2. Plats 2, 10, 18 and 26—20 tons of manure per acre. 

 Treatment 3. Plats 3, 11, 19 and 27 — 20 tons of manure per acre and 



1,000 poun'ds of gypsum per acre. 

 Treatment 4. Plats 4, 12, 20 and 28—20 tons of manure and 1,000 



pounds of 16% acid phosphate per acre. 

 Treatment 5. Plats 5, 13, 21 and 29 — 20 tons of manure and 500 pounds 



of acid phosphate — 16 per cent — per acre. 

 Treatment 6. Plats 6, 14, 22 and 30—20 tons of manure and 1,000 



pounds of acid phosphate — 16 per cent — and 1,000 



pounds of muriate of potash per acre. 

 Treatment 7. Plats 7, 15, 23 and 31—20 tons of manure and 1,000 



pounds of muriate of potash per acre. 

 Treatment 8. Plats 8, 16, 24 and 32—20 tons of manure and 1,500 



pounds of acid phosphate — 16 per cent — per acre. 



