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686 > Image 686 of Annual report. 1917

Part of Kentucky Agricultural Experiment Station

`Killing Frost and Length of Growing Season in Kentucky 123 5 _ chances he takes from probable damage_ by frosts, both in V V . spring and fall. i Q Also, the farmer should know something of the length of the growing season, or the period of safety for plant growth, in his locality, which he can in the long run depend upon. The i length of the growing season is usually considered to be the , number of days in each season between the date of the last . i killing frost in spring and that of the first killing frost in fall. A The length of a growing season considered 81 per cent. I safe, that is, safe in the long run 4 years in 5, has been com- . ,, puted for each station and results tabulated in Table 3. The i number of days practically sure and the range of probable days A li given in the~table fora particular station may reasonably be taken as typical of the section in which the station is located. I Exi>L.xN.vr1oN AND P1z.xc*r1c.xL Usn or THE Timms. 1 Table 1 gives, for each station, the computed probable t latest dates of killing frost in spring, ranging from the average A i _ date, when the risk is 50 per cent., to a date when the risk is J. g only 5 per cent. If, for example, one should want to know what .i_ I j the risk is at Blandville, or say in Ballard County, for a kill- ri __ A ing frost in spring as late as April 15, he would End from the I i A table that it is 33 1/3 percent., or 1 year in 3. If he should A i want to know the date the risk for the same locality would V. be only 20 per cent., or 1 year in 5, he would find that date . , ` . to be April 18. If he should want to know the actual earliest l T or the actual latest dates of the last killing frost in spring, on _ record at any of the stations, the information can be found in 1, the last two columns. , l Table 2 gives similar information as to the first killing 3 frost in fall. , Table 3 gives the computed length of the growing season i i for each station, which can be relied on 4 years out of 5. lf one dt should want to know the length of a growing season 81 per cent. safe from frost in both spring and fall, or practically S11I' _ l years in 5, at Blandville or vicinity, he would find it to be 170 days. However, tl1e probabilities are (from same table) that, 4 years in 5, the growing season will be as long as 133 A A . days, but not longer than 205 days. _ The charts are self-explanatory. E ni . 3 . . A V if'; i it 4 1 it Q