- 5 - 



most of our trees in Massachusetts are in sod and compete to some 

 extent with grass for nitrogen, rates 2 and 3 times that of the 

 rul e-of-thumb on non-bearing trees seem reasonable. However, the 

 fertilizer should be applied as early as possible in the spring to 

 help avoid late growth and subsequent winter injury. 



discontinued the 

 _£ --e of herbi- 

 ur orchards 

 hese trees 



In this respect, we studied the response of 3-year-old Mcin- 

 tosh trees on EM VII to simazine applications, hay and black plas- 

 tic mulch from April, 1964, to April 1967. Although no differences 

 in tree growth occurred among treatments, hay mulch increased leaf 

 N and potassium, and high leaf potassium was associated with de- 

 pressed magnesium and calcium. Therefore, under the conditions of 

 this experiment, chemical weed control was a suitable replacement 

 for the sod-mulch system of culture. The data pointed out, however, 

 the necessity of adjusting the fertilizer program to the soil man- 

 agement system being used in order to maintain an optimum level of 

 nutrition. 



Whether or not growth of young fruit trees would be improved 

 by chemical weed control, depends upon existing cultural practices 

 growing conditions and perhaps upon the nutritional status of the 

 tree. When young trees are growing in a well-established sod and 

 N and soil moisture are limiting, chemical weed control may bene- 

 fit growth. This response is apt to be less as the trees become 

 older. 



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