Effects of Potato Cyst-Nematodes On Potato Plants von Trudgill, D.L, Parrott, D.M, Evans, K, Widdowson, F.V

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Relationship between N concentration of grain and grain yield in recent winter-wheat experiments in England and Belgium, some with large yields von Benzian, B, Darby, R.J, Lane, P, Widdowson, F.V, Verstraeten, L.M.J

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effects of injecting nitrapyrin ('N-Serve'), carbon disulphide or trithiocarbonates, with aqueous ammonia, on yield and %N of grass von Ashworth, J, Penny, A, Widdowson, F.V, Briggs, G.G

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