Alopecurus agrestis, 33, 41.
Alopecurus pratensis, 157, 162, 173.
Amides in mangels, 118.
Ammonia in rain, 3, 18.
Ammonimn-salts, compared with nitrate,
44, 59, 60, 76, 82, 85, 107, 131, 157,
161, 163.
Comparative ripening effect of, 108,
117.
Leave no residue for following year,
52, 226.
Produce acid reaction in soil, 157.
Rapid nitrification of, 225.
In drainage water, 233.
Remove calcium carbonate from the
soil, 157, 238.
Retained near the surface, 76, 107.
Animals, nutrition of, 240.
Anthoxanthum odoratum, 162, 173.
Anthriscus sylvestris, 163, 179.
Arrhenatherum avenaceum, 162, 1 73.
Autumnal rainfall and soil nitrates, 223.
And wheat crop, 61.
Avena flavescens and pubescens, 157,

173, 175.
Azotobacter chroococcum, 140.
B

Bacillus radicicola in nodules of legu-
minous plants, 11.
JBacteria causing loss of nitrogen, 114,
219, 256.
289



Bacteria — continued.
Nitrogen fixation, 11, 140, 210.
Nitrification, 218.
Barley, composition of, 84, 89.
Conversion into malt, 261.
Experiments on, 70.
Grown continuously, 72.
Grown in rotation, 75, 88, 194.
Importance of phosphoric acid to,
80, 84.
Valuation of crop, 83, 88.
Barnfield, 94.
Beans, effect of, on succeeding crops in
rotation, 201.
Experiments on, 134.
Black bent grass, 33, 41.
Black medick, weed common on un-

manured wheat plot, 38, 41.
Bokhara clover, 141.
Botanical analyses of grass plots, 172.
Of wild vegetation, 138.
Boussingault — feeding experiments, 241.
Nitrification, 217.
Plant nutrition, 3.
Sources of nitrogen of vegetation, 6, 8.
Bran in flour, food value of, 269.
Briza media, 154, 160, 175.
Broadbalk field, 31, 231.
Analysis of soils, 27.
Bromus mollis, 163, 177.
Brown, H. T., cytase formed during

malting, 265.
Bushel, weight of barley, 84, 89.
Weight of oats, 93.
Weight of wheat, 55.
Calcium carbonate in Rothamsted soils,
27, 140.
T



290



INDEX



Calcium carbonate — continued.
Removed in drainage waters, 238.
