Rapport du directeur . ory, en vue de déterminer comment et quels sont les différences de capacité de production et de valeur économique. Les études chimiquesde près de cent échantillons de sol montrent ce qui suit: Livres Par acre dans Le Sol de surface. Limestoneréquirement,azote phosphore potassium* Tonnes par A. pH Moyenne 4,178 1,760 30,220 2,78 5,43 Le Plus Élevé 9,850 4,080 45,100 o 7,0 Le Plus Bas 826 502 17,800 7,57 4,1 12 sols seulement. Un exemple de ce que ces résultats peuvent signifier est montré avec soilNo. I, les études préliminaires de pot sur W^hich ont commencé en 1925. Station D'EXPÉRIMENTATION du Connecticut BULLETIN 274 Les analyses ont montré

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Report of the director . ory, with a view to determining how and whythey differ in productive capacity and economic value. Chemicalstudies of nearly one hundred samples of soil show the following: Pounds Per Acre in Surface Soil. Limestonerequirement, Nitrogen Phosphorus Potassium* Tons per A. pH Average 4, 178 1, 760 30, 220 2.78 5.43 Highest 9, 850 4, 080 45, 100 o 7.0 Lowest 826 502 17, 800 7.57 4.1 12 soils only. An example of what these results may mean is shown with soilNo. I, preliminary pot studies upon w^hich were begun in 1925. CONNECTICUT EXPERIMENT STATION BULLETIN 274 The analyses showed 3, 550 lbs. nitrogen, 1, 238 lbs. phosphorusand 43, 000 lbs. potassium per acre in the surface soil, with alimestone requirement of three tons per acre, and a high activeacidity, 4.9 pH. The total phosphorus content was considerablybelow the average, and chemical tests showed this phosphorus tobe in a very unavailable state. The illustration indicates theresponse of alfalfa when phosphorus and lime were applied to thissoil.. Fig. 36.—The effect of several treatments on Soil No. i as shownby the growth of Alfalfa. K = Potash, P =3 Phosphoric Acid, L =: Lime. THE TOBACCO STATION AT WINDSOR On March first, 1925, Dr. Paul J. Anderson took charge of theTobacco Substation, since which time the program has goneforward in a very satisfactory manner. Several special problems arose during the year, notably a severeoutbreak of wire worms. The staff at Windsor with the ento-mologists at New Haven spent considerable time in testing varioustreatments and secured fair results from the use of calcium cyanidedrilled in. If there is another outbreak in 1926, this will be testedfurther. It has been known for a long time that Black Roof rot injurymight be increased by making the soil too alkaline, but there wasno accurate data on just how acid a soil must be kept to be safe. REPORT OF THE DIRECTOR 203 Studies carried on in the past season indicate that a soil may testas high as 5.9 pH without danger

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