. Bulletin. Agriculture. 28 ORCHAED GREEN-MANURE CROPS IN CALIFORNIA. during the cool weather of the winter, thus affording a heavier growth to be turned under. This is an especially strong point where it is desirable to turn the crop under as early as possible, as is the case in the citrus orchards of southern California. The plants referred to are the black-purple vetch, the black bitter vetch, the woolly-podded vetch, the horse bean, and the Tangier pea. BLACK-PURPLE VETCH. The black-purple vetch (Vicia atrojmrjmrea) is one of the most promising green-manure crops tested for California. Its
. Bulletin. Agriculture. 28 ORCHAED GREEN-MANURE CROPS IN CALIFORNIA. during the cool weather of the winter, thus affording a heavier growth to be turned under. This is an especially strong point where it is desirable to turn the crop under as early as possible, as is the case in the citrus orchards of southern California. The plants referred to are the black-purple vetch, the black bitter vetch, the woolly-podded vetch, the horse bean, and the Tangier pea. BLACK-PURPLE VETCH. The black-purple vetch (Vicia atrojmrjmrea) is one of the most promising green-manure crops tested for California. Its general. Fig. 7.—a field of black-purple vetch at Chico, Cal. appearance and habit of growth are about like those of the com- mon vetch (fig. 7), although it is very distinct from that species. The superior value of black-purple vetch when compared with com- mon vetch lies in its ability to make a much stronger growth during the cool weather of early winter. This, as noted elsewhere, is an especially desirable quality in a green manure to be turned under in February, The root system of black-purple vetch, which is similar to that of common vetch, is well covered with medium large nodules. The stems, aside from making a strong growth, are of such a texture as 190. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Plant Industry. Washington : G. P. O.
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