Some accessory factors in plant growth and nutrition

摘要: Recent research has demonstrated the importance of presence minute amounts certain substances as accessory factors in normal dietaries man and animals. The most striking examples influence these are seen their curative effect on diseases beri-beri scurvy, stimulative growth young Beri-beri is caused by deficiency a diet polished rice nitrogenous substance, small which essential found husks, barely, wheat, lentils, yeast, egg-yolk, milk, etc., precipitated from an aqueous solution alcoholic extract bodies phosphotungstic acid. It effective very amounts, addition to 0·02 grm. Of active fraction curing polyneuritis (beri-beri) pigeons.