#1. 'Soil fertility and fertilizers' was written by
#2. Who suggested that the principal nourishment of plant was water?
#3. Who gave the statement 'water was the sole nutrient of plants' ?
#4. _____ suggest that saltpeter (KNO3), and not water, was the 'principle of vegetation'.
#5. 'Horse hoeing husbandry' was written by
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