Jump to navigation Jump to search
|This scientist article is a stub. You can help Wikiquote by expanding it.|
- The chief processes for the improvement of soils which may be discussed here are: liming, claying and marling, warping, paring and burning, and green manuring. Most of these more or less directly improve the land by adding to it certain plant food constituents which are lacking, but the effect of each process is in reality very complex. In the majority of cases the good results obtained are more particularly due to the setting free of " dormant " or " latent " food constituents and to the amelioration of the texture of the soil, so that its aeration, drainage, temperature and water-holding capacity are altered for the better.
- "p. 349 of section Improvement of Soils (pp. 349–351) in article Soil". 1911 Encyclopædia Britannica. pp. 345–352.
- Among the world's crops wheat is pre-eminent both in regard to its antiquity and its importance as a food of mankind. In prehistoric times it was cultivated throughout Europe, and was one of the most valuable cereals of ancient Persia, Greece, and Egypt.
- The Wheat Plant: A Monograph. London: Duckworth & Co. 1921. p. 3.
Quotes about Percival
- The wheat taxonomist has a difficult job. The variation in Triticum/Aegilops is extraordinary and one has only to look through the enormous herbarium collection of wheat that John Percival amassed to see the diversity. Hybridization and polyploidy have occurred frequently and been assisted by man over a long period, complicating the systematics enormously.
- Stephen L. Jury in "Wheat Taxonomy". Wheat Taxonomy: the legacy of John Percival, eds. P. D. S. Caligari and P. E. Brandham, The Linnean Special Issue 3. Academic Press. 2001. pp. 61–64. (quote from p. 61)