Manganese deficiency in wheat sandy and high pH soils, foliar manganese sulphate, do not mix with lime.
7 Answers
Manganese deficiency is fairly common in wheat on light, sandy, high pH, and over limed soils, showing as interveinal yellowing with greyish specks or streaks on younger to middle leaves and weak growth. Soil applied manganese tends to get locked up quickly on such soils, so the practical correction is foliar manganese sulphate, often around 0.5 to 1 percent (5 to 10 g per litre), sprayed 2 to 3 times at weekly intervals starting when symptoms appear. Do not mix manganese sulphate with lime in the same spray. Avoid over liming these soils and keep good organic matter. Confirm the deficiency and dose with your soil test and KVK before spraying, and do not over apply.
Foliar manganese sulphate is the way on our sandy fields, soil application just got locked up and did nothing. I spray two or three times a week apart once the greyish streaking shows on the middle leaves and the crop recovers. Putting it in the soil was money down the drain here.
Timing matters, start spraying as soon as you see the first specks, do not wait. When I left it late one year the wheat stayed weak and never fully caught up. Catching it early with the first foliar spray made the recovery much quicker and the patches greened back up.
Watch your liming on these light soils, because over liming pushes manganese out of reach and brings the problem back. I had been liming heavily and that made my manganese trouble worse. Easing off the lime and keeping FYM up reduced how often I needed the sprays.
Foliar manganese sulphate is the only thing that worked on our sandy Ludhiana fields, soil application just got locked up. I spray two or three times a week apart once the greyish streaks show on the middle leaves and the wheat recovers.
Start spraying the moment you see the first specks, do not wait. When I left it late one year the wheat stayed weak and never fully caught up. Catching it early made the recovery much quicker.
Ease off the liming on these light soils, because over liming pushes manganese out of reach and brings the trouble back. Heavy liming made mine worse. Cutting the lime and keeping FYM up reduced how often I needed to spray.