Scientific Agriculture. 



410 



At Bathurst, and at the Hawkesbury College, where conditions are more 

 favourable, the benefits of green-manuring are even more striking. Mr. Allen 

 obtained similar samples of tops and roots, representing the produce of one 

 square yard from crops grown at these places, and they gave the following 

 figures :— 



At Bathurst, the tops weighed 17 lb. and the roots 2 lb. 5 oz. per square 

 yard, or 36 tons 14 cwt. tops and 5 tons of roots per acre, giving a total of 

 dry matter to be ploughed under of 4 tons 15 cwt. from the tops and 16 cwt. 

 from the roots. Assuming the same nitrogen content in tops and roots as was found 

 in the Wagga plants, this will give when ploughed under 411 lb. nitrogen per 

 acre from the tops and 22 lb. nitrogen from the roots. 



At Hawkesbury, the produce was 21 tons 12 cwt. tops and 4 tons 14 cwt. 

 roots per acre. When ploughed under, this would yield 2 tons 16 cwt. dry matter 

 from the tops and 16 cwt. dry matter from the roots. With 5 per cent, nitrogen 

 in the tops and "2 per cent, in the roots, the soil will be enriched in nitrogen 

 by 242 lb. per acre from the tops and 22 lb. from the roots,— F, B, Guthrie in 

 the Agricultural Gazette of New South Wales, Nov. 1905. 



