Abstract

Shattering of pods of oilseed rape (Brassica napus L.) is a major cause of seed yield losses prior to and during harvesting. In order to reduce shattering, researchers have been engaged in the development of special preparations that are known as pod sealants (PS). Despite the fact that there are already developed and commercialized PSs that have only been effective on seed yield preservation under certain environmental conditions, there is still a need to create a more versatile and efficient PS. Currently, the most promising method of controlling pod shattering in oilseed rape is the application of our developed novel acrylic- and trisiloxane-based pod sealant (PS4). The effectiveness of PS4 and three commercial pod sealants (PS1, PS2, and PS3) was assessed in this comparative study. By spraying an oilseed rape crop with PS4, natural seed loss can be reduced by 20–70%, depending on the prevailing weather conditions, and loss of seeds during harvest can be reduced by more than three-fold compared with that by the control treatment. Thus, the overall results demonstrated that by applying a novel pod sealant (PS4) to oilseed rape crops 2 weeks before harvest can increase the net profit margin by €30–€150 ha−1. The life cycle assessment showed that during 2014–2016 oilseed rape cultivation, the largest effect on global warming emission (kg CO2 eq) reduction was experimental sealant PS4, i.e., approximately 17% compared to the control.

Highlights

  • Oilseed rape (OSR, Brassica napus L.) belongs to the Brassicaceae family, is a globally important oilseed crop that probably originated in the Mediterranean region, and is widely grown in temperate agricultural regions [1,2,3]

  • Naujokienė et al [44] in a Lithuanian study found that the carbon footprint for winter oilseed rape (WOSR) cultivation depends on soil biopreparation and varies in range from 682.00 to 1136.89 kg CO2 eq Mg−1

  • It can be concluded from the Life Cycle Assessment (LCA) results that the global warming potential (GWP) for OSR production in Italian regions amounts to 1106 kg CO2 eq Mg−1 in Sardinia [45] and to 1300 kg CO2 eq Mg−1 of seed generated in the Campania [46]

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Summary

Introduction

Oilseed rape (OSR, Brassica napus L.) belongs to the Brassicaceae family, is a globally important oilseed crop that probably originated in the Mediterranean region, and is widely grown in temperate agricultural regions [1,2,3]. No study has evaluated the influence of different weather conditions on OSR pods treated with this sealant in terms of their pod strength or moisture content and subsequent losses prior to and during harvesting. Naujokienė et al [44] in a Lithuanian study found that the carbon footprint for winter oilseed rape (WOSR) cultivation depends on soil biopreparation and varies in range from 682.00 to 1136.89 kg CO2 eq Mg−1 It can be concluded from the LCA results that the global warming potential (GWP) for OSR production in Italian regions amounts to 1106 kg CO2 eq Mg−1 in Sardinia [45] and to 1300 kg CO2 eq Mg−1 of seed generated in the Campania [46].

Materials and Methods
Laboratory Measurements of Pod Strength
Moisture Determination of Seeds and Pod Valves at Harvest
Determination of OSR Seed Losses Prior to Harvesting
Determination of OSR Seed Losses during Harvesting
Evaluation of Pod
Environmental Evaluation of Pod Sealants Use
Statistical Analysis
Weather
Weather conditions
Seed Losses Due to Spontaneous Shattering Prior to Harvesting
Seed Losses Due to Shattering during Harvesting
Conclusions

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