Dec. 2, 1920.] Agricultural Gazette of N.S.W, 839 



Nyngan Experiments. 



The west Bogan country, on which these experiments are being conducted, 

 may be described as a medium loam, and is part of the « drift formation '' 

 which includes a large area of our western plains. 



This account must only be accepted as a progress report, for, although the 

 experiment has been carried on for nine years, and although the plots receive 

 every time they are ploughed, the treatments which the experiment has been 

 designed to test, yet, owing to the rotation practised, the wheat crop 

 occupies the same site only every third year. A comparable result is there- 

 fore only obtained once in three years, and it may be that as time goes on, 

 results which are now only slightly apparent will become intensified. If so, 

 they should be noticeable on all three areas. The experiment will be 

 continued for at least another nine years. 



The costs per acre of the various operations at Nyngan have been 

 estimated as follows : — Disc ploughing, 4 inches, 6s. 6d. ; disc ploughing, 

 6 inches, 7s. 6d. ; disc ploughing, 8 inches, 8s. 6d. ; mouldboard ploughing, 

 4 inches, 7s. ; mouldboard ploughing, 6 inches, 8s. ; mouldboard ploughing 

 8 inches, 9s.; subsoiling, 13s. 6d. ; reploughing, 6s. ; sub-packing, 2s. Hay 

 has been reckoned as worth £5 per ton. 



The area of each plot was approximately one-seventh of an acre. The 

 following table shows the average of the resTjlts for the five years 1911, 1912, 

 1913, 1916, and 1917. In the years 1914, 1918, and 1919, the crops were fed 

 off as not being sufficiently promising to keep for hay : — 



Treatments in Order of Merit. 



Yield per 



acre based on 



percentage 



yield. 



Increase 



due to 



Treatment. 



Value of 

 Increase. 



Increased 



Cost of 



Treatment. 



Net Gain. \ Net Loss. 



*Disc 6 inches, reploughed 



•Disc 6 inches, sub-packed 

 and reploughed ... 



Mouklboard 4 inches 



Disc 8 inches 



Disc 4 ,, 



Mouldboard 6 inches, sub- 

 packed 



Disc 6 inches, sub-packed, 

 reploughed and sub- 

 packed 



Mouldboard 6 inches 



Disc 6 inches, reploughed 

 and sub-packed ... 



Disc 6 inches, sub-packed .. 



Mouldboard 8 inches, sub- 

 soiled 10 inches ... 



Mouldboard 8 inches 



Mouldboard 6 inches, sub- 

 packed, reploughed and 

 sub-packed 



Mouldboard 4 inches, sub- 

 soiled 



* The high average results for these 

 reploughing produced twice the j'ie' 



0. q. 

 19 2 



19 

 15 

 15 

 14 



14 3 



16 



13 3 



14 3 

 13 1 



15 2 

 12 2 



12 1 

 10 2 



c. q. 



4 3 



4 3 



1 



1 



Nil. 



1 1 



1 Of 



Nil. 



1 2t 



3 



2 It 



£ s. d. 



Nil. 



3 6 



6 3 11 6 

 5 Ot 1 6 



Nil. 

 7 6t 



3 9 

 11 3t 



2 2t I 12 6t 

 4 It 1 1 3t 



9 6 



3 



16 



2 6 



11 6 



1 6 



3 6 



5 3 



6 6 



9 6 



10 6 



12 3 



13 9 



1 4 



2 1 9 



two plots are due to two abnormallv wet years (for Nyngan) in which 

 Id of the check plots. t Hec-rease, not increase. 



