6 



AGEICULTUEAL OBSEEVATIONS ON TRUCKEE-CAESON PEOJECT. 



The occurrence of frosts is markedlj' influenced by the local topog- 

 raphy of the land, as the cold air settles into the low places when the 

 air is calm. Some observations made at the experiment farm in the 

 spring of 1910 show the extent of this influence in a typical location. 

 Two registering minimum thermometers were placed 190 feet apart, 

 one of them in a hollow betAveen two long, low hills, and the other 

 on the highest point on one of the hills at an elevation of 13| feet 

 above the level of the one in the hollow. During April, 1910, the 

 average minimum temperature on the hill was 4.2 degrees warmer 

 than in the hollow, Tlie record Avas kept IT days in ISIay, during 

 which time the average minimum hill temperature was 3.2 degrees 

 warmer tlian in the hollow. The greatest differences occurred on 

 those nights when there was little or no wind. A maximum differ- 

 ence of 10 degrees occurred on the night of April 2."). Xo instance is 

 recorded when the minimum temperature was higher in the hollow 

 than on the hill. These results, given in detail in Table III, indicate 

 that tender fruits and vegetables will be in less danger of being- 

 injured b}^ late spring frosts when planted on the higher lands. 



Table III. — DaUu hiiiihiiiuii tiiitixraiiircs recorded hij tico 1h< nnoinctcrs, one 

 on a hill and the other in a low place, on the Truckce-Cdrson Experiment 

 Farm, Fallon, iS'ci-., during the months of April and May, 1910} 



Apr. 1. 



s! 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 27. 



Date. 



1910. 



Date. 



Apr. 28. 

 29. 

 30. 



1910. 



Average for mouth. 

 Mav 1 



9 



10 



11 



12 



13 



14 



15 to 27. 



28 



29 



30 



31 



Temperature. 



On 

 hill. 



' F. 



44 

 36 

 47 



39.0 



Average for month . . 



35 

 38 

 43 

 38 

 26 

 34 

 42 

 45 



(2) 

 42 

 39 

 40 

 48 

 49 

 (2) 

 44 

 54 

 54 

 56 



42.7 



In 

 draw. 



•P. 

 41 

 33 

 46 



34.8 



34 

 36 

 42 

 38 

 24 

 28 

 38 

 37 

 50 

 41 

 38 

 35 

 45 

 46 

 (2) 

 40 

 51 

 47 

 52 



Differ- 

 ence. 



39.5 



1 Distanco apart of nicrninnietcrs, 190 feet; dilTcnMico in elevation, V.''l feet. 

 - Itccords not obtained. 



[Cir. 7S] 



' F. 

 3 

 3 

 1 



4.2 



3.2 



