June, 1939] Agricultueal Research ix N. H. 17 



cals are not present, it causes pronounced increase when either cal- 

 cium arsenate or acid lead arsenate are used. 



It has been generally believed that lime-sulphur spray containing 

 calcium arsenate is more injurious than that containing lead arse- 

 nate ; but in these experiments lead arsenate was found to be more 

 toxic than calcium arsenate. The difference, however, was not 

 great. 



In experiments made comparing the effects of lime-sulphur and 

 flotation sulphur (finely divided sulphur, nearly pure) on beans and 

 potatoes, it was found that on beans .5'f flotation sulphur is non- 

 toxic and even 2% is less injurious than the regular 1-50 lime- 

 sulphur. In the case of potatoes, lime-sulphur reduced the yield 

 somewhat more than flotation sulphur. Beans show spray injury by 

 curling or rolling up of leaves as well as by loss of weight. On pota- 

 toes, although the yield is decreased, the injury is not visible on foli- 

 age and can only be checked by loss of weight in the individual plants. 

 (Adams Fund) 



Effect of Fertilizer Placement on the Vitality of the 



Potato Seed Piece 



In this experiment carried on by S. Dunn, potato plants were 

 grown in clay loam and in sandy loam, at temperatures of 21 C. and 

 16 C. and with and without fertilizer. As in previous work, the seed 

 used was cut from the apical, or bud, end of the potato for one series 

 of plants and from the basal end for the other. Fertilizers, when 

 used, were applied in the following different ways : 28 grams per pot 

 distributed in a circle two inches in diameter and almost touching the 

 seed piece; 28 grams per pot distributed in a circle two inches in 

 diameter approximately one-half inch from the seed piece ; as above 

 with 21 grams of fertilizer instead of 28. Results were that placing 

 the fertilizer in a band one-half inch distant from the seed piece did 

 not retard the growth as all the sprouts emerged from the soil at the 

 same time. 



The rate of growth of the fertilized plants was more rapid than 

 that of the unfertilized plants, especially in the cultures growing at 

 the cooler temperature. 



The plants grown from basal seed pieces grew more vigorously 

 than those from the apical seed pieces and in the fertilized cultures 

 grown at the higher temperature they were the more productive, but 

 in the cultures grown at the lower temperature yielded less. In the 

 cultures that received no fertilizer, the plants from distal seed pieces 

 were more productive than those from basal seed pieces. (Adams 

 Fund) 



Potatoes in Storage 



In the 1937-38 experiments, carried on as in previous years by 

 P. T. Blood and 0. R. Butler, potatoes w^ere stored in a commercial 

 storage house and in small experimental bins at the university espe- 

 cially constructed for the purpose of studying types of ventilation. 



Ideally, the temperature of potatoes in storage should be warmer 

 at the top than at the bottom with the ceiling slightly warmer than 

 the potatoes. Results in the commercial bin were not so satisfactory 

 as they might have been because these temperature conditions were 



