Nov. 2, WYli). 



Agricultural Gazette of N.S.W. 



783 



The manurial trials, if will We noticod, all show substantial increases by 

 the us(! of artificial t'ci'tiliscis. 'I'hf; gi'(!at(;Kt iti(;r(;aK(!H in yicAd wei-e obtained 

 from the use of 1'7, which conlain.s ID';") per cent. phoH])hoi-i(; aeid and 1 •S.'j 

 jjer cent, nitrogen. Tliis fertiliscu" has given remarkably consistc^nt nisults 

 ■with potatoes, maize and winter fodders in de[)artmental trials on the coast. 

 The following tabic; shows the value of thf; incn^ased yields due to 

 fertilisers : — 



Locality. 



Greatest 

 , in'Tcanf due to | 

 I terliliHor. i 



l\iii'! rji |''(:rtillHcr. 



Approxlinalu 

 Total CoHt 

 per acre. 





Killing .Market 



Price at 

 liar\cHl lime. 



Nclt 

 IncrcaHC. 



The price of potatoes on tlu; market was exc(!pti(jnally good lust season, 

 and tlie profits from manuring, therefore, ap])ear very high. Tn the aV)ov(! 

 table the cost of fertiliser is a liberal estimaU!, iM<-liiding cost of f(!rtiliser in 

 .Sydney plus freight and cai-tage. In tin- first three cases tli(!se additional 

 costs were considerable. It will he s(!(!n that tin; market price of potatoes 

 would have to Vh; v(;iy low for the application of fertilisers to be a losini.' 

 proposition. 



Varieties. 



All th(! vari(!ties under trial are more or less well known, with the possible 

 exception of Premier and N(!W Era These varieti(;H liav(; been introduced 

 into coastal variety ti-ials rec(';ntly on account of tlxiir reputed resistance to 

 [lish blighf, but the disease did not mak(5 its ap[)(!arance during the last two 

 seasons, lienei; no flata is available;. They li.iv(! both yi(dd(!d so pooily in all 

 trials that even if tliey prove disf^ase-resistant tli(;y cannot be regarded as 

 profitahh; coastal varieties for spiing planting. 



Till' only disease noticeable in any variety was what is conmionly known 

 as " milky eye," and this appeared in the plot of New Kra, al, horrigo, whenj 

 almost f'O per cent, of the tubcu-H were allecKid. 



Premier is a late maturing variety with smo(»th pink skin, and of similai- 

 shape to Early Ro.s(!. 



New P^ra is a whit(! rougli-skirined late maturing variety, roun.l in shape 

 and with fairly deep eyes. 



The PlotB. 



Dorrigo. — Soil, n,! volcanic, typical of the better cla.s» land of the plateau ; 

 site first cultivated four years ago ; previous crop maize, which was harvesUid 

 late, allowing of only one ploughing (a month before planting) to [.repare for 

 j)otatoes. Sown 7th to 9th October, 1919 ; drills 2 feet 7 inches apart, sets 

 «lroi)ped every 12 to 1.0 inches, pressed firndy into the loo.sc; soil with foot, 

 and covered with succee.ling furrow. Plots each one-sixth of an acre 



