Abstract
Abstract To investigate whether form of nitrogen supplied to cauliflower can affect its boron uptake via soil pH changes, a glasshouse pot experiment was carried out using a sandy loam soil. Nitrogen was supplied as calcium nitrate or as ammonium sulphate + N‐serve. A zero‐N treatment was also included, and these three treatments were factorially combined with two liming levels and two soil boron levels (i.e. with and without both materials). Nitrogen form had a small but very important influence on final soil pH, and the total amount of B in the mature leaves could be very largely explained in terms of this pH, falling about five‐fold between pH 7.0 and 7.4. The B concentrations and total amounts in young leaves and stems were less clearly related to treatment or final soil pH.
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