Abstract: The invention provides a concentrate for dilution with water in the preparation of an agriculatural composition for application to crops, soil or animals and comprising an agricultural chemical whose agricultural activity varies with the pH of the water; and the invention provides a method of preparing such agricultural composition by mixing the concentrate with water and effecting such pH modification to the composition as is necessary to obtain a pH in the composition at which the agricultural activity of the chemical is acceptable. The concentrate comprises an active ingredient and a pH indicator for colouring the water, and the proportions of pH indicator and active ingredient are selected so that when the concentrate is diluted with water to provide an effective concentration of active ingredient in the water, the pH indicator indicates visually whether or not the pH of the water is suitable for acceptable agricultural activiy of the chemical.

Abstract: The invention provides a concentrate for dilution with water in the preparation of an agricultural composition for application to crops, soil or animals and comprising an agricultural chemical whose agricultural activty varies with the pH of the water; and the invention provides a method of preparing such agricultural composition by mixing the concentrate with water and effecting such pH modification to the composition as is necessary to obtain a pH in the composition at which the agricultural activity of the chemical is acceptable. The concentrate comprises an active ingredient and a pH indicator for colouring the water, and the proportions of pH indicator and active ingredient are selected so that when the concentrate is diluted with water to provide an effective concentration of active ingredient in the water, the pH indicator indicates visually whether or not the pH of the water is suitable for acceptable agricultural activity of the chemical.