Tag Archives: growth stages

447–455 Z. Jelínek, K. Starý and J. Kumhálová
Assessment of production zones modelling accuracy based on satellite imaging and yield measurement of selected agriculture plot
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Assessment of production zones modelling accuracy based on satellite imaging and yield measurement of selected agriculture plot

Z. Jelínek*, K. Starý and J. Kumhálová

Czech University of Life Sciences Prague, Faculty of Engineering, Department of Machinery Utilization, Kamýcká 129, CZ165 00 Prague, Czech Republic
*Correspondence: jelinekzdenek@tf.czu.cz

Abstract:

Currently, remote sensing or yield monitor equipment offer possibilities how to estimate productivity of the agriculture field. That is why the main aim of this study is to assess how the latest satellite images from vegetation season and final yield data from combine harvester can be used to predict yield and to assess site-specific zones productivity. The study is focused on the accuracy of these systems for the field productivity estimation. The 24.7 ha experimental field is located near to Vendoli village (the Czech Republic) and it is cultivated by conventional agricultural practices with emphasis on typical agricultural crops growing in the Czech Republic (winter wheat, spring barley and winter rape). The results showed that both methods of estimation can be used for yield prediction. Nevertheless, each of them need specific processing and has typical limitations.

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501-507 R. Vicente1,2, R. Morcuende1 and J. Babiano2
Differences in Rubisco and Chlorophyll Content among Tissues and Growth Stages in Two tomato (Lycopersicon esculentum Mill.) Varieties
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Differences in Rubisco and Chlorophyll Content among Tissues and Growth Stages in Two tomato (Lycopersicon esculentum Mill.) Varieties

R. Vicente1,2, R. Morcuende1 and J. Babiano2

1Institute of Natural Resources and Agrobiology of Salamanca, IRNASA–CSIC, Apartado 257, 37071 Salamanca, Spain; e-mails: ruben.vicente@irnasa.csic.es; rosa.morcuende@irnasa.csic.es
2University of Salamanca, Department of Plant Physiology, Campus Miguel de Unamuno, 37008 Salamanca, Spain; e-mail: babiano@usal.es

Abstract:

Ribulose-1,5-bisphosphate carboxylase oxygenase (Rubisco) is a key enzyme in the photosynthetic assimilation of CO2 and the most abundant leaf protein. The amounts ofchlorophyll (chl) and Rubisco have often been considered, respectively, as indices of light harvesting and Calvin cycle capacities of leaves. The purpose of this study was to analyze the changes in chlorophyll content and the level of Rubisco protein in various plant tissues at different growth stages in two tomato (Lycopersicon esculentum Mill.) varieties. The results show an increase of the amount of both chlorophyll and Rubisco protein at vegetative growth stages (leaf expansion), which was followed by a gradual decline during anthesis, probably as a consequence of changes in the balance of their synthesis and degradation reported previously –Rubisco could be remobilized and reused in the production of reproductive structures. However, the increase in the amount of Rubisco and chlorophyll at ripening stage (more in Tres Cantos variety) contrasts with the decrease reported in other studies when degradation is becoming predominant during senescence.

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263-271 E. Stanislawska-Glubiak and J. Korzeniowska
Yield of Winter Wheat Grown under Zero and Conventional Tillage on Different Soil Types
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Yield of Winter Wheat Grown under Zero and Conventional Tillage on Different Soil Types

E. Stanislawska-Glubiak and J. Korzeniowska

Institute of Soil Science and Plant Cultivation, National Research Institute in Pulawy,
Department of Weed Science and Tillage Systems in Wroclaw,
Orzechowa 61, 50-540 Wroclaw, Poland; e-mail: e.glubiak@iung.wroclaw.pl

Abstract:

In three-year field trials, conducted in West Poland, the growth and development of winter wheat grown under zero tillage (ZT) and conventional tillage (CT) methods on four soils were investigated. The soils were different mainly in grain fraction distribution and content of organic matter. The tested soils were sandy loam (SL), loamy sand (LS-1, LS-2) and sand (S). In GPS-fixed sites, in ZT and CT fields, yield of aerial part biomass in four growth stages: stem elongation, second node, and heading and inflorescence phases, was compared. In addition, yields of grain and straw were tested. On medium and coarse textured soils (SL, LS-1, LS-2), more biomass was produced by wheat under CT than ZT, but on very coarse textured soil (S), the biomass yields obtained from wheat growing under both soil tillage methods were identical. On medium textured soils and on coarse textured (LS-1) soil, wheat under CT contained more N and P as well as much more Ca and Mg in tissues than under ZT. In contrast, on the other coarse textured (LS-2) soil and on very coarse textured soil, wheat plants under ZT were generally characterized by identical or slightly higher nutrient content than plants under CT. Despite periodic fluctuations in biomass yields between ZT and CT for particular growth stages of wheat, the yields of grain and straw were the same for both soil tillage methods, irrespective of the soil type.

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