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State Agricultural Experiment Station, Groningen. Report on several years' manurial trials on 33 fields


State Agricultural Experiment Station, Groningen. Report on several years' manurial trials on 33 fields



Verslag. Landbouwk. Onderzoekingen, 39A, 103-294



An interim report is presented on manurial trials conducted by the Groningen Station under the direction of Professor O. de Vries. Twelve of the thirty-three experimental fields were grassland, most of them on heavy clay without CaCO3. The following are the principal results. Top dressings of lime are slow in penetrating the soil. The form in which N and P are given has a perceptible effect on the pH value of the uppermost 5 cm. if 100 kg. N and 100 kg P2O5 per hectare are applied.

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