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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