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TABLE XII. SUMMARY OF RESULTS FOR 1924 ON PHOSPHORIC ACID PLOTS.

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1 Net price per pound after deducting 11 cents for sorting, packing, sweating and overhead.

These results are not in accord with those presented by Jenkins as discussed above. No explanation of the contradictory results will be attempted until the tests have been carried further.

The highest average yield for the three years was obtained where 225 lbs. of phosphoric acid were supplied by addition of both acid. phosphate and precipitated bone to the organic carriers (P1) but the best quality was obtained on P3 where the acid phosphate was omitted but the P2O, brought up to 191 lbs. by addition of precipitated bone. The latter also gave the highest net return per acre of all the phosphoric acid plots in 1924. The effect of omitting all carriers of mineral phosphoric acid was noticeable only by a slight reduction in quality.

POTASH SERIES.

This series of experiments was begun in 1923 and continued through 1924 with three treatments in duplicate on the same field as the nitrogen and phosphoric acid series. The object of the tests was to compare the effect of supplying one half or all of the potash in double sulfate of potash magnesia instead of supplying it all in high grade sulfate of potash. The occurrence of "sand drown" during 1922 in the other plots previously mentioned suggested the advisability of supplying magnesia in the fertilizer ration. the cheapest and most convenient carrier of magnesia is the double manure salt, it has been most frequently used as the source of this element in fertilizer mixtures. It seemed advisable therefore to find out what effect its use would have on the yield and quality of the leaf.

Goessman, in the experiments in Massachusetts previously referred to, after three years of testing, sums up his conclusions in regard to it: "Our results with potash magnesia sulfate as main potash sources of a tobacco fertilizer are not encouraging". In rating the ten fertilizer formulas which were tried he places the two which contained double manure salt at the foot.

Jenkins, in the five year experiment at Poquonock, found that the plot treated with double manure salt gave a higher yield than the plots treated with any other carrier of potash. The quality of leaf, however, was not so good and the fire-holding capacity was less than all the rest except high grade sulfate which stood at the foot of the list although the yield was good. Thus he ranks double sulfate above high grade sulfate while Goessman does just the

reverse.

In the face of these contradictory experimental results there appeared to be need of further tests. It was decided to compare plots where double manure salt was the only source with those in which high grade sulfate was the source and also with plots where the ration contained a mixture of the two carriers. The fertilizer ration of each of the plots is as follows:

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PLOT K2. ALL K2O IN DOUBLE SULPHATE OF POTASH MAGNESIA.

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PLOT K3. K2O DIVIDED BETWEEN SULFATE AND DOUBLE SULFATE.

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No differences in growth during the season of 1923 were noted. Sorting data on the primed leaves as taken by Slagg are recorded in Table XIII.

During the first year of this experiment no appreciable effects were seen on the yield and quality of the tobacco. The percentages of the two top grades of plots K1, K2 and K3 were 48%, 51.4% and 50.3%, respectively.

The experiment was conducted during 1924 in the same manner as in 1923. The tobacco on the K2 plot was somewhat taller than on the other plots. Otherwise no differences in growth were noticed.

The tobacco was harvested, stripped, and sorted at the same time as the nitrogen plots. Table XIV gives the sorting data on the plots.

TABLE XIII. SORTING DATA ON POTASH SERIES.

Experiments of 1923 by C. M. SLAGG.

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Data on fire-holding capacity of the fourth priming for some unexplained reason was omitted. If this were recorded it would reduce the average slightly.

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33

107

16

20

120

159

127

136

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27.99

22.35 23.94

19.92

5.8

TABLE XIV.

SORTING RESULTS FOR 1924 CROP ON THE POTASH PLOTS.

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