Aluminum Foil Wrappings Look Good in Preventing 

 Sun Scald of Fruit Tree Trunks 



Trunks oi fruit varieties which are normally very susceptihle to winter 

 "sun scald" have shown no injury during the last two years when they 

 have heen wrapped with aluniiiunn toil. Unwrapped trunks of some of the 

 same varieties have shown considerable injury even though we have not 

 had severe winters during the past two years. 



More observations will be necessary to determine the effectiveness 

 of the alumnium foil in preventing sun scald during severe winters. 



R. Eggert 



Potash and Phosphorous Fertilizers Do Not Increase the 

 Amount of Red in the Skin Color of Northern Spy Apples 



Nitrogen applications to hay-mulched Northern Spy apple trees in- 

 tensifies the green ground color of the fruit. The potassium- and phos- 

 phorus-fertilized trees, plus hay mulch, and the hay-mulched trees with- 

 out fertilizer supplements are somewhat, but not significantly, better colored 

 than the mulched trees receiving the nitrogen, phosphorus, and potassium 

 supplement. This happens because the paler green ground color of fruit 

 on trees fertilized with potassium and phosphorus results in apparent 

 greater brilliance of red color but does not increase the amount of the red 

 pigment in the skin of the fruit. 



L. P. Latimer, R. Eggert 



Increasing the Magnesium Content of Grasses 

 Used for Mulching Apple Trees 



The magnesium content of orchard grass and timothy can be greatly 

 increased by fertilizing the plants with soluble magnesium-containing com- 

 pounds. Grasses with high magnesium content are more valualjle for 

 nuilching, particularly when used to control magnesium deficiency in fruit 

 trees. 



L. P. Latimer, R. Eggert, 

 G. P. Percival, S. Dunn 



Lettuce Tipburn in Northern New Hampshire 



Shortly after thinning out plants in the lettuce rows in a river-l)ottom 

 field at Colebrook, 8 plots of 50 plants each were treated with l)orax at the 

 rate of 20 pounds per acre. At harvest time there was no signficant differ- 

 ence between lx)rax-treated and adjacent untreated plots as far as the 

 incidence of tipburn was concerned. Certain areas in a 30-acre field showed 

 less tipburn than others. This apparently was due to the stage of maturit}- 

 of the lettuce rather than to nutritional differences. Plants on a steep slope 

 and on level land were slower to reach maturity than those growing on 

 level land above this slope and, coincidentally, were less affected with tip- 

 l)urn at the time of observation. 



L. P. Latimer 



Phosphorus Absorption by Apple Trees 



Much of the phosphorus in fertilizers applied annually to soils in New 

 Hampshire l)ecomes fixed and made unavailable to the plants. Tests were 



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