Demeter Technology

Boron on Oilseed Rape

All crops require B though the requirement is less in monocots than in dicots.Brassicae species have a high requirement for B

Removal of crops and leaching of B is leading to a decrease in soil B levels

B Deficiency

B deficiency commonly occurs on coarse textured soils

Decreasing organic matter levels in soils increase risk of B deficiency

Heavy rainfall can exacerbate B deficiency

Hot dry weather can increase B deficiency as lower soil levels usually have lower B levels

Climatic factors, which reduce transpiration, may reduce the amount of B moving to flowers

High light intensities increase sensitivity to B deficiency

B in plants

B is implicated in:

Sugar transport

Cell wall synthesis


Carbohydrate metabolism


Auxin metabolism

Effects of B deficiency

Boron deficiency inhibits root growth

Uptake of P is lower in the root tips of B deficient plants

B deficiency can result in cracked stems

In some plants insect damage has been shown to be higher in B deficient plants

B is required for pollen tube growth and pollen viability and thereby for seed development

B deficient crops are more susceptible to frost damage

B requirement

A 4 t/ha crop of OSR requires 320g Boron for growth and removes 80g/ha B in the crop ( Sharrocks)


Application of B to the soil can provide season long elevation of the B status of the crop

Rate 1-2 kg/ha B

Movement of B in annual crops is limited, thus applications to the foliage will have little effect on the pollination and seed set - several applications have been shown to be more effective than a single application

Some of the B applied to foliage will reach the ground and be absorbed by roots

Sharrocks recommends application of 1-2kg/ha B regardless of method of application- this is in line with the view that the efficacy of foliar applications during the early growth of annual crops depends on absorption by roots as well as leaves, and the poor phloem mobility of B

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