Dry Edible Beans: Fertility Management
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811: Agronomy Guide > Dry
Edible Beans > Fertility Management
Nitrogen fertilizers are not usually necessary for dry edible beans. However, where phosphate fertilizers are banded, a small amount of nitrogen (10 kg/ha or 9 lb/acre) may improve the availability of the phosphate. Where edible bean yields have been low due to bronzing or root rots, apply up to 100 kg/ha (90 lb/acre) of nitrogen before planting. Under these conditions, nitrogen will increase yield but will not cure the bronzing or the root rot. Seed size was found to increase slightly by the application of nitrogen. Nitrogen application potentially can delay maturity, particularly following high legume sod or where manure is applied.
1 HR, MR, LR, RR and NR denote, respectively, high,
medium, low, rare and no probabilities of profitable crop response
to applied nutrient. Profitable response to applied nutrients occurs
when the increase in crop value, from increased yield or quality,
is greater than the cost of the applied nutrient.
Phosphate and Potash
Phosphate and potash recommendations for dry edible beans are presented in Table 5-5, Phosphate and Potash Recommendations for Dry Edible Beans Based on OMAFRA-Accredited Soil Tests. For information on the use of this table or if an OMAFRA-accredited soil test is unavailable, see Fertilizer Recommendations.
Methods of Application
To avoid seed burn, do not place fertilizer in contact with the seed. The fertilizer may be broadcast and plowed down, worked in before planting or applied through a planter that has a separate attachment for fertilizer placement.
For dry edible beans, sampling the top fully developed leaf (three leaflets plus stem) at first flowering is recommended. See Table 5-6, Interpretation of Plant Analysis for Dry Edible Beans, opposite page. Sample plants suspected of nutrient deficiency as soon as the problem appears. If sampling at other than the recommended time, collect samples from both healthy and injured areas so comparisons can be made correctly. Take a soil sample from the same area and at the same time as a plant sample. Values in Table 5-6 apply to the top fully developed leaf (three leaflets plus stem) at first flowering.
Manganese deficiency in dry edible beans has been diagnosed occasionally
in Ontario. This problem is more likely to occur on muck soils or
on very sandy soils. Plants with manganese deficiency have pale
green-to-white upper leaves. The veins of affected leaves will remain
green. Correct the deficiency as soon as it is detected by spraying
the foliage with 2 kg/ha of actual manganese (1.8 lb/acre) from
manganese sulphate (8 kg/ha or 7.1 lb/acre of manganese sulphate)
in 200 L (53 gal) of water. Use of a "spreader-sticker"
1 Yield loss due to nutrient deficiency is expected
with nutrient concentrations at or below the "critical"
Zinc deficiency rarely occurs in beans. It is most likely to occur in spots where the topsoil has been lost. Zinc deficiency can be corrected by foliar spray application of 0.5% zinc sulphate spray in 190 L/ha (76 L/acre), plus wetting agent. One kilogram (2.21 lb) of zinc sulphate in 200 L (53 gal) of water makes a 0.5% solution. Zinc chelate is also effective as a spray. Soil application is not effective.
Beans are very sensitive to boron and should not be grown in a field where boron was applied to rutabagas the year before.
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