EJPAU 2016. Walczykova M. , Zagórda M. ENVIRONMENTAL EFFECTS OF SPATIALLY VARIABLE NITROGEN APPLICATION

Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

2016
Volume 19
Issue 1

Topic:

Agricultural Engineering

ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES

Walczykova M. , Zagórda M. 2016. ENVIRONMENTAL EFFECTS OF SPATIALLY VARIABLE NITROGEN APPLICATION, EJPAU 19(1), #11.
Available Online: http://www.ejpau.media.pl/volume19/issue1/abs-11.html

ENVIRONMENTAL EFFECTS OF SPATIALLY VARIABLE NITROGEN APPLICATION

Maria Walczykova, Mirosław Zagórda
Department of Machinery Management, Ergonomics and Production Processes, Faculty of Production and Power Engineering, University of Agriculture in Krakow, Poland

ABSTRACT

The purpose of this study was to study the effects of N fertilizer topdress application with timing based on plant demands and using variable rates technology for spreading. The experiment was carried out on two commercially managed fields of 13 (F1) and 19 (F2) hectares. On both fields, phosphorus and potassium were applied uniformly. As far as nitrogen is concerned, half of the required dosage was spread uniformly on both fields in the early spring. On field F1 the second half was arbitrarily split into two rates and applied uniformly at the beginning of two growth stages – shooting and earing. On field F2 the dosage of N fertilizer, applied at the same time as stated above, was based on plant nutrient requirement and was spread using the spatially variable technique. After harvest, soil sampling on both fields for mineral nitrogen residues was carried out. It was found that the topdressing application of the N fertilizer, based on greenness measurements, resulted in 28.2 and 20.8% decrease of the required dosage at the shooting and earing growth stages accordingly, and in lower nitrogen residues, by 19.8–56.1%, in examined layers, and yield higher by ca 27%, in comparison with the arbitrary determined and uniformly spread rates.

Key words: nitrogen, residues, SPAD, topdress application, variable rates, yields, winter wheat.

Maria Walczykova
Department of Machinery Management, Ergonomics and Production Processes, Faculty of Production and Power Engineering, University of Agriculture in Krakow, Poland
Balicka 104, 30-149 Cracow, Poland
Phone: (012) 662 4634
email: rtwalczy@cyf-kr.edu.pl

Mirosław Zagórda
Department of Machinery Management, Ergonomics and Production Processes, Faculty of Production and Power Engineering, University of Agriculture in Krakow, Poland
Balicka 104, 30-149 Cracow, Poland
email: miroslaw.zagorda@poczta.fm

Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.