. Bulletin. Natural history; Natural history. Sept., 1970 Neely, Himelick, Crowley; Tree Fertilization 263 200 - 160- 120 80- 40- NITR06EN UNTREATED 1963,64,65. PRECIPITATION (cm) JUNE TO AUGUST OCTOBER TO MARCH 1 1963 1 1964 1 r 1965 1966 1 1967 1 1968 Fig. 8. — The diame+er growth of three species of trees in the method test at Lisle was correlated /ith the quantity of precipitation occurring in (i) 6 fall and winter months prior to the growing eason and (ii) 3 summer months during the growing season. fertilizers in holes in the soi
. Bulletin. Natural history; Natural history. Sept., 1970 Neely, Himelick, Crowley; Tree Fertilization 263 200 - 160- 120 80- 40- NITR06EN UNTREATED 1963,64,65. PRECIPITATION (cm) JUNE TO AUGUST OCTOBER TO MARCH 1 1963 1 1964 1 r 1965 1966 1 1967 1 1968 Fig. 8. — The diame+er growth of three species of trees in the method test at Lisle was correlated /ith the quantity of precipitation occurring in (i) 6 fall and winter months prior to the growing eason and (ii) 3 summer months during the growing season. fertilizers in holes in the soil, injection of liquid fertilizers into the soil, and spraying of foliage. The following nu- trient elements or combinations of ele- ments were used: N, PK, NPK, and NPK plus minor elements. When elemental nitrogen was added to the soil at the rate of g per sq m (6 lb per 1,000 sq ft), tree growth in- creased significantly. Increased growth persisted only 1 or 2 years after treat- ment ceased. April appUcations in- creased growth more than October applications. The application of phosphorus and potassium to the soil did not bring about a significant growth response; nor did a combination of phosphorus, potassium, and nitrogen produce a response that was significantly greater than that pro- duced by nitrogen alone. The addition of minor elements to NPK produced no significant growth response. The three methods of soil application appeared to be about equally efl'ective, with minor variations among the tree species. Foliar sprays did not produce a substantially greater growth than the growth of unfertilized trees. LITERATURE CITED Beilmann, a. p. 1936. Feeding the shade trees. Missouri Botanical Garden Bulletin 24:95-113. (Article signed merely ) Broadfoot, W. M. 1966. Five years of nitro- gen fertilization in a sweetgum-oak stand. Forest Service Research Note SO-34. Southern Forest Experiment Station, New Orleans, Louisiana. Chadwick, L. C. 1934. The fertilizat
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