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Your search keyword '"Pirjo Mäkelä"' showing total 3 results
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3 results on '"Pirjo Mäkelä"'

1. Response of forage maize yield and quality to mulch film and harvest time in Northern Europe

Author

Anniina Lehtilä, Auvo Sairanen, Seija Jaakkola, Tuomo Kokkonen, Kaisa Kuoppala, Tapani Jokiniemi, Daniel Wasonga, and Pirjo Mäkelä

Subjects
forage production, silage maize, Zea mays L., feed quality, mulching, forage harvest, Agriculture, Agriculture (General), S1-972
Abstract

Forage maize (Zea mays L.) yield and nutritional quality fluctuate markedly in Northern Europe due to weather conditions. A field experiment was conducted in Southern Finland (Helsinki, 2018–2020) and in Central Finland (Maaninka, Kuopio, 2019–2020) to study the effect of harvest time and use of mulch film, in order to optimize the dry matter (DM) yield and quality. Treatments included oxo-biodegradable mulch film and no mulch, and three harvest times (the latter only in Helsinki). Mulch film increased DM yield on average by 2.3 Mg ha-1 in Helsinki and by 3.8 Mg ha-1 in Maaninka. Mulch film had a minor effect on the quality, and overall, the quality improved, although DM yield accumulation had already ceased. Nevertheless, the starch contents fluctuated and remained mostly below the target rate – 300 g kg-1 DM – especially in Central Finland. The results indicate that mulch film improves forage maize yield, but a late harvest is still required to improve forage quality. However, climate conditions still restrict starch accumulation to ears in Northern European climate conditions, especially in the important milk production area in Central Finland.

Published
2023

2. Yield, Quality and Nitrogen Use of Forage Maize under Different Nitrogen Application Rates in Two Boreal Locations

Author

Anniina Liimatainen, Auvo Sairanen, Seija Jaakkola, Tuomo Kokkonen, Kaisa Kuoppala, Tapani Jokiniemi, and Pirjo Mäkelä

Subjects
Agronomy and Crop Science, nitrogen fertiliser, nitrogen recovery, forage production, forage quality, maize silage
Abstract

Research focusing on the nitrogen (N) application and N use of forage maize (Zea mays L.) in the boreal region is either limited or non-existent. The aim of this study was to investigate the response of yield, quality and N recovery efficiency (NRE) of forage maize to an increase in the N application rate and different climatic conditions in two locations in Finland. The field experiment was conducted in southern (Helsinki; 60° N) and central (Maaninka; 63° N) Finland in 2019 and 2020. Dry matter (DM) yield, forage quality and NRE were determined for N application rates of 100, 150 and 200 N kg ha−1. The DM yield was similar to all studied N application rates. Moreover, there were no marked differences in the studied forage quality traits or the NRE following the N application rates. However, the NRE of maize was generally low at 45%. The current study recommends a N application rate of 100–150 N kg ha−1 for forage maize in the boreal region. There is no need to increase the N application from current recommendations since climate conditions seem to limit the growth, development and NRE of forage maize. The observed low NRE of forage maize warrants further research in the future.

Published
2022
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3. Root-applied glycinebetaine decreases nitrate accumulation and improves quality in hydroponically grown lettuce

Author

Kari Jokinen, Minnamari Edelmann, Pirjo Mäkelä, Anna-Kaisa Johanna Salovaara, Ilkka Simpura, Daniel O. Wasonga, Department of Agricultural Sciences, Crop Science Research Group, Department of Food and Nutrition, Food quality and safety: lipids, vitamins and other bioactive compounds, Helsinki Institute of Sustainability Science (HELSUS), and Plant Production Sciences

Subjects
0106 biological sciences, ASSIMILATION, Lactuca, Growth, BETAINE, 01 natural sciences, 4111 Agronomy, Analytical Chemistry, 03 medical and health sciences, chemistry.chemical_compound, Betaine, Hydroponics, Nitrate, nitrate, Vegetables, NITROGEN FORMS, LEAVES, AMINO-ACIDS, Dry matter, FRUITS, 030304 developmental biology, Minerals, 0303 health sciences, Nitrates, biology, Lactuca sativa, Maximum level, EXOGENOUS APPLICATION, General Medicine, RED, biology.organism_classification, glycinebetaine, Amino acid, Plant Leaves, lettuce, Horticulture, chemistry, Amino acid composition, Osmolyte, Leafy vegetables, Nutrient film technology, 010606 plant biology & botany, Food Science
Abstract

Leafy vegetables like lettuce (Lactuca sativa L.) naturally have high nitrate content and the European Commission has set maximum level for nitrate in lettuce. Glycinebetaine is an organic osmolyte alleviating plant stress, but its role in leaf nitrate accumulation remains unknown. The uptake of glycinebetaine by lettuce roots, and its potential to regulate lettuce nitrate content and improve plant quality were investigated. Two hydroponic lettuce experiments were conducted with different glycinebetaine application rates (Exp1 : 0, 1, 7.5, and 15 mM; Exp2: 0, 1 + 1 + 1, 1 + 10, and 4 mM). Plants were analyzed at varying time points. Root application resulted in glycinebetaine uptake and translocation to the leaves. Glycinebetaine concentrations > 7.5 mM reduced leaf nitrate up to 40% and increased leaf dry matter content. Glycinebetaine showed a positive effect on leaf mineral and amino acid composition. Thus, glycinebetaine could be a novel strategy to reduce the nitrate content in hydroponic lettuce.

Published
2022
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