8 N. H. AGR. EXPERIMENT STATION. [Bulletin 190 



Plot 8 — Excess Phosphorus. Cultivation and cover crop with the following 

 complete fertilizer per tree: 



2 pounds nitrate of soda, 

 4 pounds sulphate of potash, 

 17 pounds acid phosphate. 

 Plot 9 — Excess Nitrogen. Cultivation and cover crop, with the following 

 complete fertilizer per tree: 



6 pounds nitrate of soda, 

 4 pounds sulphate of potash, 

 , 8 1 pounds acid phosphate. 



Plot 10 — Excess Potassium. Cultivation and cover crop, with the following 

 complete fertiUzer per tree: 



2 pounds nitrate of soda, 

 10 pounds sulphate of potash, 

 8 1 pounds acid phosphate. 



GENERAL RESULTS. 



Before taking up the individual plots it might be more con- 

 venient to examine the results as a whole. The general summary 

 for ten years is therefore first considered. 



Weather Conditions. 



In the discussion of this work, especially if viewed from a com- 

 mercial standpoint, it should first be pointed out that the loca- 

 tion is not favorable for such an experiment because the true be- 

 havior of the trees is not fairly reflected in the yield of fruit which 

 has been obtained. In the ten years here reported we have had 

 only four good crops of fruit (1910, 1912, 1914, 1916) due pretty 

 largely to frosts and freezes. For instance in 1913 a severe frost 

 reduced the crop to practically nothing although the first two 

 plots were not so badly damaged. Our records show that the 

 estimate made of the percentage of blossoms in all plots in 1913 

 was within 4 per cent as high as in 1910 when we had a full crop. 

 We have previously considered that the orchard would have 

 borne at least a half a crop that year but under favorable con- 

 ditions it might have been considerably more than that. While 

 these estimates of the percentage of blossoms cannot be exact 

 yet they are certainly indicative. Again in 1915, when at least 

 a third of a crop appeared likely, the entire crop was lost by frost 

 which again cuts down our average appreciably. In 1917 the 

 orchard did not blossom very full, the average estimate of all 



