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Effects of poultry manure and mineral fertilizers on the quality of crops

Published online by Cambridge University Press:  27 March 2009

F. Pimpini
Affiliation:
Istituto di Agronomia generale e Coltivazioni erbacee, Università di Padova, Via Gradenigo, 6 – 35131 Padova, Italy
L. Giardini
Affiliation:
Istituto di Agronomia generale e Coltivazioni erbacee, Università di Padova, Via Gradenigo, 6 – 35131 Padova, Italy
M. Borin
Affiliation:
Istituto di Agronomia generale e Coltivazioni erbacee, Università di Padova, Via Gradenigo, 6 – 35131 Padova, Italy
G. Gianquinto
Affiliation:
Istituto di Agronomia generale e Coltivazioni erbacee, Università di Padova, Via Gradenigo, 6 – 35131 Padova, Italy

Summary

Poultry manure and mineral fertilizers at two rates of application (medium and high) and in different combinations, together with a non-fertilized control, were tested at the Experimental Station of the Agricultural University of Padova, Italy (45° 21′ N, 11° 58′ E) in 1985–89.

Compared to the control, all the fertilization treatments increased the incidence of larger-sized bulbs of onion and tubers of potato, improved the fruit colour of processing tomato and the raw protein content of spinach, but reduced the acidity and acids: soluble solids ratio of tomato and the dry matter content of spinach leaves.

In addition, the application of 140 kg/ha of N, 140 kg/ha of P2O5 and 100 kg/ha of K2O as mineral fertilizer or as poultry manure gave the best scores of processing suitability of potato, both for sticks and chips. All the fertilization formulae, except for 140 kg/ha of N, 140 kg/ha of P2O5 and 100 kg/ha of K2O as poultry manure alone, showed significant decreases in the extractable sucrose ratio in sugarbeet, compared with the control. In processing tomato, the best scores of suitability for paste transformation were obtained with mixed fertilization (1/3 poultry manure and 2/3 mineral fertilizers) applying 210 kg/ha of N, 210 kg/ha of P2O5 and 150 kg/ha of K2O and the plots receiving only mineral fertilizers produced fruits with less favourable values of pH and electrical conductivity compared to the poultry manured ones.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 1992

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