Published in Scientific Papers. Series A. Agronomy, Vol. LXV, Issue 1
Written by Angelina MUHOVA, Stefka STEFANOVA-DOBREVA
The aim of the study was to determine the reaction of cotton to different fertilizer rates and combinations under the influence of different weather conditions. In 1966 a long-term stationary fertilizer experience was established at the Field Crop Institute in Chirpan, Bulgaria. The results represent 2019 and 2020 crop years. The experiment was based on two-field crop rotation. Cotton variety Philipopolis was grown with durum wheat, without irrigation. The following doses of nitrogen and phosphorus were applied: 40, 80, 120 and 160 kg ha-1. Potassium fertilizer was used at a rate of 80 kg ha. N0P0K0 was adopted as a control. N160P40 had the greatest effect on seed cotton yield and boll weight; N160P80 - lint yield and ginning; N160P120 - plant height; N120P120 - number of boll per plant and N40P80 - fiber length. The strongest correlation was observed between lint yield and ginning (P = 0.902***), and fiber length was negatively related to all traits. Yield and yield components can be strongly influenced by different weather conditions.
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