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Deficiencies appear as pale green or yellow leaves and reduced leaf size. Symptoms occur as a result of poor nodulation, low calcium, low pH, ineffective strains of rhizobia or deficiencies of molybdenum in the soil.
Either sodium or ammonium molybdate may be used as a foliar treatment to correct the problem after crop emergence. Seed treatments of molybdenum are also beneficial, and the addition of lime to neutralize a soil acidity problem increases soil molybdenum availability. |