SUPER AND BONE FLOUR

Hawera Star, Volume LI, 3 January 1931, Page 13

SUPER AND BONE FLOUR

A well-known authority says': ' It. is advisable to use the more soluble phosphates, for dry conditions. Where such dry soils are chalky, or limy, superphosphate is a safe and suitable material. High-grade basic slag will act as well as the superphosphate, but some of the low-grade, basic slags and many of the. samples of ground mineral phosphate already tried have not always given such good results Of tiie bone phosphates,' steamed hone flour is the only one deserving serious consideration for grazing land; bonemeal, which contains 4 or 5 per rent, of nitrogen, is unnecessarily expensive. since any nitrogen required can be purchased more cheaply .in the form of one or other of the nitrogenous j artificial fertilisers. The choice be-1 tween the two water-soluble phosi hates—su pcrphosphates and <listsol ved hones —usually depends on relative costs.’ - i