Text-book of Scientific Agriculture: with Practical Deductions. Intended for the Use of Colleges, Schools, Private StudentsA.S. Barnes, 1875 - 419 pagine |
Sommario
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Parole e frasi comuni
absorb absorption acre albuminoids alumina ammonia amount animals atmosphere becomes Boussingault capillary carbonic acid cells cellulose cent chemical chemists chlorine clay soils clouds clover cold color combination constitutes contains corn cotton seed crops cultivation decay decomposed deposited dextrin earth elements exhaled exists experiments fact feet fertilizers fibres fruit gases germination grains grow growth heat humus hydrogen hygroscopic imbibed important inches ingredients insoluble iron land leaves Liebig lime liquid magnesia maize manure mineral moist moisture nitrates nitric acid nitrification nitrogen nutritive oats organic matter oxide oxygen ozone pectin phos phosphoric acid plant-food plough potash pounds produced Prof quantity rain rocks roots rows salts sand sandy soils saturated silica soda soluble soluble matters starch stem stomata subsoil substances sugar sulphate sulphuric acid superphosphate supply surface temperature tion tissue trees vapor vegetable weather wheat wood
Brani popolari
Pagina 69 - God made the earth and the heavens, and every plant of the field before it was in the earth, and every herb of the field before it grew : for the Lord God had not caused it to rain upon the earth, and there was not a man to till, the ground. But there went up a mist from the earth, and watered the whole face of the ground.
Pagina 246 - A soil to be fertile for cultivated plants, must, as a primary condition, contain in sufficient quantity the nutritive substances required by those plants. But chemical analysis, which determines this relation, gives but rarely a correct standard by which to measure the fertility of different soils, because the nutritive substances therein contained, to be really available and effective, must have a certain form and condition, which analysis reveals but imperfectly.