Little information is available on either the proximate analysis or vitamin content of the different varieties of avocado. Changes in the concentration of these nutrients with crop year, season, and period of refrigeration or ripening after refrigeration are also largely unknown. This study included such comparisons for seven B vitamins as well as the usual proximate analyses in samples from four crop years of Fuerte, two of Anaheim, and one of Hass avocados. HE AVOCADOS grown in California

An intelligent but untrained person might be taught to prepare and insert a cion (386) 1 in the most approved way. This pertains to the art of grafting. The same person might be taught the reasons why each step of the process is performed in its particular manner. This pertains to the science of grafting. One may become a skilled grafter without learning the science of grafting, but one cannot graft intelligently. The artisan, however skillful, who knows only the art, cannot become a master workman in the highest sense until he learns also the science that underlies his trade. The art of doing any kind of work is best learned by working under the guidance of a skilled workman. The science is best learned from books and laboratory and field experimental studies with the help of trained instructors. Science not yet wrought out, and hence not explained in publications, is learned by close, persistent and thoughtful investigation. 3. Environment is a term used to express all the outside influences, taken as a whole, that affect a given object in any way. A plant or animal, for example, is affected by various external conditions, as heat, moisture, light, food and so on. These conditions and all others that influence the plant or animal make up its environment. 4. What is plant culture ? The well-being of a plant, or animal depends very much upon a favorable condition of environment, and with the proper knowledge, we can do much toward keeping the environment in a favor-1 The numbers in parenthesis in the text refer to the numbered paragraphs in this book, and are intended to help students to a better understanding of the subject. Students should be urged to look up these cross-references. end of which the life disappears and the body loses more or less promptly its form and properties. 9. Vigor and feebleness are terms used to express the relative energy manifested by the life of different living beings. Certain trees in the nursery row usually outstrip others in growth, i.e., are more vigorous than others. One

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Barrel pump for small orchard. Good spray outfit for low trees. Power sprayer for commercial orchard Two good types of spray nozzles. Tarred paper cards for protecting stems of young plants Tool for cutting cards ..... Manner of using tool in cutting cards. Curculio catcher .... Steam sterilization of greenhouse soil Apple-scab on leaves. .. .

Globally, the most prevalent type of farming systems use resource intensive methods and are referred to as conventional agriculture. While this type of agricultural system is responsible for providing crops for the majority of the world's food and biomaterials, there are consequences that come with the high production.