Laserfiche WebLink
BORON IN IRRIGATION WATERS <br /> Boron toxicity in many areas is traceable to use of irrigation waters with boron <br /> content in excess of 1ppm. The UC Ag. Extension laboratories are using the following <br /> interpretation as regards boron content of irrigation water: <br /> Below 0.5 ppm Satisfactory for all crops. <br /> 0.5— 1.0 ppm Satisfactory for most crops; sensitive crops may show <br /> injury(may show leaf injury but yields may not be <br /> affected.) <br /> 1.0—2.0 ppm Satisfactory for semi-tolerant crops. Sensitive crops are <br /> usually reduced in yield and vigor. <br /> 2.0— I O.Oppm Only tolerant crops produce satisfactory yields. <br /> There is no economically feasible method of removing boron from irrigation <br /> Water. Similarly,there is at present no chemical or soil amendment which can <br /> economically be added to the soil to render the boron nontoxic. However, growers in <br /> some areas are learning to live with marginal boron and salinity condition by: <br /> 1)Maintaining fertility levels slightly above the usual "optimum." <br /> 2)By irrigating a little more frequently than"normal." <br /> RELATIVE TOLERANCE OF PLANTS TO BORON <br /> (In each group the plants first named are considered as being more sensitive <br /> and the last named more tolerant) <br /> SENSITIVE SEMI TOLERANT TOLERANT <br /> Lemon Lima Bean Carrot <br /> Grapefruit Sweet Potato Lettuce <br /> Avocado Bell Pepper Cabbage <br /> Orange Tomato Turnip <br /> Thornless Blackberry Pumpkin Onion <br /> Apricot Zinnia Broad Bean <br /> Peach Oat Gladiolus <br /> Cherry Milo Alfalfa <br /> Persimmon Corn Garden Beet <br /> Kadota Fig Wheat Mangel <br /> Grape(Sultanina&Malaga) Barley Sugar Beat <br /> Apple Olive Palm <br /> Pear Ragged Robin Rose (Phoenix Canariensia) <br /> Plum Field Pea Date Palm <br /> American Elm Radish (Phoenix Dactylifera) <br /> Navy Bean Sweet Pea Asparagus <br /> Jerusalem Artichoke Pima Cotton Athel(Tamarix Aphylla) <br /> Persian(English)Walnut Acala Cotton <br /> Black Walnut Potato <br /> Pecan Sunflower(Native) <br />