Graduate Thesis Or Dissertation
 

The effect of rootstock and scion on cherry tree mineral nutrition

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  • The experiments in this thesis are reported as two journal articles. The first article. The effect of rootstock and scion on above- and below-graft leaf mineral nutrient content of sweet cherry, is a field sampling experiment dealing with the effect of Stockton- Morello and F 12-1 mazzard rootstocks on 'Royal Ann' and 'Corum' scion leaves and the effect of the scions on the rootstocks. The rootstocks affected the level of Ca in the 'Corum' scion. 'Royal Ann' affected the level of Fe, Cu, and Zn in the rootstock leaves. 'Corum' affected the level of K, P, Mg, Fe, Cu, and B in the rootstock leaves. The rootstock interacted with the scion for K, P, Mg, Fe, Cu, B, and Zn. The second experiment, The effect of rootstock and scion on the distribution of mineral nutrients in first-season grafted and ungrafted sweet cherry trees, is a sand culture experiment using Stockton- Morello, mahaleb seedling, mazzard seedling, and F 12-1 mazzard rootstocks and 'Royal Ann', 'Corum', and homografts as scions. The plants were divided into rootlets, main roots, below graft trunk, below graft twigs, below graft leaves for August and September, graft union, above graft trunk, above graft twigs, and above graft leaves for August and September. Statistical comparisons were made among the plants for the same part and between parts of the same plant. Rootstock, scion, and graft union were found to affect either singly or in combination both among plant and within plant comparisons for N, K, P, Ca, Mg, Mn, Fe, B, and Zn. Ninety day old August and 38 day old September leaves were found to differ in K, Ca, Mg, B, P, and Mn content. Mahaleb leaves were found to contain only 33 ppm of B, about 33 of the next lowest leaves. A strong positive relationship between leaf content and root efficiency was noted for the root efficiency data contained in the appendix.
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