Some effects of different soils on composition and growth of sugar beet

Plants from plots with different soil type and with and without nitrogenous fertiliser were harvested at 2–4 weekly intervals during 1960 and 1961 and analysed for N, P, K and Na. The uptake and distribution of the elements are discussed in relation to the yields obtained on the different soils. The effect of nutrients on yield was exercised to a large extent through leaf area duration. The yield of different centres and years was closely related to N‐supply as measured by N‐uptake. The silty loam had a high nutrient status, including a sodium level equivalent to 3 cwt. of salt/acre/year, while the oolitic limestone soil had limited K and P availability. On the clay‐with‐flints, in 1960, potassium was a limiting factor, while in 1961 nitrogen was limiting. Nitrogen application was found to limit availability of P to roots. Losses, particularly of Na and K from roots, were found towards the end of the growth period, and may be important in relation to juice purity, particularly if they can be encouraged by cultural practice.