Archive image from page 4 of Day length and crop yields. Day length and crop yields daylengthcropyie507park Year: 1942 Day Length and Crop Yields By M. W. PARKER, physiologist, and H. A. BORTHWICK, morphologist, Bureau of Plant Industry, Agricultural Research Administration The successful production of crop plants is dependent upon manj factors, such as relative fertility of the soil, rainfall, soil moisture, tem- peratures prevailing ai different tunc- of the year, and light condi- tions. It is seldom that all these factors are present in any given locality in such combination that it is no
Archive image from page 4 of Day length and crop yields. Day length and crop yields daylengthcropyie507park Year: 1942 Day Length and Crop Yields By M. W. PARKER, physiologist, and H. A. BORTHWICK, morphologist, Bureau of Plant Industry, Agricultural Research Administration The successful production of crop plants is dependent upon manj factors, such as relative fertility of the soil, rainfall, soil moisture, tem- peratures prevailing ai different tunc- of the year, and light condi- tions. It is seldom that all these factors are present in any given locality in such combination that it is not possible for man to modify them to the extent that more abundant crop yields of better quality are secured. Indeed, such modification of the environment in which plants grow and the selection of plants adapted to specific environ- ments constitute a large part of agricultural practice. It is the special duty of the experimentalist to find ways and means of accomplishing these desired results in the most direct and economical manner possi Ble. The search for and the substitution of more effective practices for those which are less efficient are the marks of progress of an ever- changing agricull ure. It has long been known that light conditions affect plants in a variety of ways. Many studies have shown, for example, that the intensity of light is an important factor- in determining the character and rate Timothy, a hay crop, heads during the long days of early summer. - â .â¢â 'R
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Keywords: 1940, 1942, archive, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, borthwick_h_a_harry_alfred_1898_, crop_yields, drawing, historical, history, illustration, image, page, parker_m_w_marion_wesley_1907_, picture, plant_photoperiodism, plants, print, reference, vintage, washington_d_c_u_s_dept_of_agriculture
