Wisconsin State Horticultural Society / Annual report of the Wisconsin State Horticultural Society for the year ending July 1, 1921
Vol. LI (1921)
Roberts, R. H.
Off-year apple bearing, pp. 72-78 PDF (1.8 MB)
-1 . _- *.: : , .-,_ -m-r. - .- --- - .' ._ ; . , . Ad A n 76 FIFTY-FIRST ANNuAL REPORT OF pruning end-and I want to emphasize pruning especially. When starting out to modify the growth in the orchards, measure the results by the growth made by the trees. Find out whether or not sufficient terminal growth is made so that the second-year wood forms blossom buds on it. Find out, if there are any great number of spurs about the trees that do not form blossom buds. If so, find out whether they are in the undervegetative class, or in the overvegetative class. Usually the thing that we have to deal with under most situations is to make the trees more vegetative. So we come to a consideration of fertilizers, and one thing that we are especially interested in is nitrogen fertilizer. This is for two reasons. In the first place, under very few situations are the other elements so limited in the soil that they materially reduce the growth of the trees. Too little nitrogen certainly does limit growth. In the second place, the spur growth on trees is made very early in the season. The spurs that form blossom buds complete their growth in length about the time the tree comes to full blossom. That means, in most parts of the state about the 10th or 15th of May. We find that there is practically no nitrogen measurable in the soil at that time of the year, a thing that we want to get clearly in mind in relation to fertilizer treatment. In order to enable the trees to make the kind of growth we want, make an application of a readily available nitrogen fer- tilizer early in the season, three or four weeks before the trees can be expected to blossom in your respective localities. It seems advisable in many of our locations here in the state to use a clover sod with a quickly available nitrogen fertilizer. This will give growth, good initial size to the fruit, and better colored fruit. There is considerable evidence accumulating, that the difference in growth secured between sod and cultivated orchards is not one of moisture conditions; it is the difference in the nitrogen that is available for the tree in the cultivated soil. DISCUSSION. QUESTION: What was that last statement? PROF. ROBERTS: Apparently the difference between cultiva- tion and sod in the orchard may be its effects on nitrification in the soil, and not upon big differences in the moisture content. There is considerable evidence to show that we can get the
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