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Agronomy, Volume 10, Issue 3

March 2020 - 136 articles

Cover Story: High quality fruit production requires the regulation of the crop load on fruit trees by reducing the number of flowers and fruitlets early in the growing season, if the bearing is too high. In this article, the multi-view perspective from the Red–Green–Blue (RGB) colored dense point clouds retrieved from drone imagery are compared and evaluated against the field-based flower cluster number per tree. Experimental results obtained on a dataset of two pear tree orchards (N = 144) demonstrate that our 3D object-based method, a combination of pixel-based classification with the stochastic gradient boosting algorithm and density-based clustering (DBSCAN), significantly outperforms the state-of-the-art in flower cluster estimations from the 2D top-view (R2 = 0.53), with R2 > 0.7 and RRMSE < 15%. View this paper
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Articles (136)

  • Communication
  • Open Access
11 Citations
4,170 Views
10 Pages

The Change of Bacterial Spectrum after Storage of X. campestris pv. campestris Inoculated Cabbage Heads (Brassica oleracea var. capitata L.)

  • Lucia Ragasová,
  • Eliška Peňázová,
  • Filip Gazdík,
  • Jakub Pečenka,
  • Jana Čechová,
  • Robert Pokluda,
  • Miroslav Baránek,
  • Dariusz Grzebelus and
  • Aleš Eichmeier

24 March 2020

Changes in the bacterial spectrum of cabbage heads after storage under commonly used storage conditions were examined in this study. Cabbage seeds (Brassica oleracea var. capitata L.) were artificially inoculated with X. campestris pv. campestris (Xc...

  • Article
  • Open Access
15 Citations
4,453 Views
17 Pages

24 March 2020

Adding biochar to excessive compost amendments may affect compost mineralization rate and nitrogen (N) availability. The objective of this 371-day incubation study was to evaluate the effects of four proportions of woody biochar (0%, 0.5%, 1.0%, and...

  • Article
  • Open Access
43 Citations
6,617 Views
15 Pages

Effects of Management Practices on Quinoa Growth, Seed Yield, and Quality

  • Ning Wang,
  • Fengxin Wang,
  • Clinton C. Shock,
  • Chaobiao Meng and
  • Lifang Qiao

24 March 2020

Quinoa (Chenopodium quinoa Willd.) yield potential needs to be further achieved by good management practices to meet the increasing global demand. Two years of orthogonal field experiments were undertaken to investigate the effects of irrigation onse...

  • Article
  • Open Access
26 Citations
4,853 Views
21 Pages

New Approaches for the Assimilation of LAI Measurements into a Crop Model Ensemble to Improve Wheat Biomass Estimations

  • Andreas Tewes,
  • Holger Hoffmann,
  • Gunther Krauss,
  • Fabian Schäfer,
  • Christian Kerkhoff and
  • Thomas Gaiser

24 March 2020

The assimilation of LAI measurements, repeatedly taken at sub-field level, into dynamic crop simulation models could provide valuable information for precision farming applications. Commonly used updating methods such as the Ensemble Kalman Filter (E...

  • Article
  • Open Access
29 Citations
7,461 Views
17 Pages

Biomorphological Characterization of Brazilian Capsicum Chinense Jacq. Germplasm

  • Paola Alvares Bianchi,
  • Lígia Renata Almeida da Silva,
  • Antônio André da Silva Alencar,
  • Pedro Henrique Araújo Diniz Santos,
  • Samy Pimenta,
  • Cláudia Pombo Sudré,
  • Lígia Erpen-Dalla Corte,
  • Leandro Simões Azeredo Gonçalves and
  • Rosana Rodrigues

24 March 2020

Loss of biodiversity and ecosystem degradation become major concerns worldwide, making the conservation process an important strategy for maintaining biodiversity. Capsicum chinense Jacq. is the most Brazilian species of the genus, with representativ...

  • Article
  • Open Access
43 Citations
6,032 Views
11 Pages

Effect of Natural Aging of Biochar on Soil Enzymatic Activity and Physicochemical Properties in Long-Term Field Experiment

  • Barbara Futa,
  • Patryk Oleszczuk,
  • Sylwia Andruszczak,
  • Ewa Kwiecińska-Poppe and
  • Piotr Kraska

24 March 2020

The effect of different rates of biochar on selected soil properties and enzymatic activity 48, 60, and 72 months after biochar application to soil was investigated. Soil enzymatic activity (dehydrogenase—ADh; phosphatase—Aph; urease&mdas...

  • Article
  • Open Access
10 Citations
4,376 Views
16 Pages

Persistence and Changes in Morphological Traits of Herbaceous Seeds Due to Burial in Soil

  • Pavel Saska,
  • Hana Foffová,
  • Zdenka Martinková and
  • Alois Honěk

24 March 2020

Seeds in soil banks can survive for many years before conditions become more suitable for germination. Meanwhile, seeds undergo changes in morphology and viability. In this study, we launched an artificial seed bank experiment that included 26 specie...

  • Article
  • Open Access
42 Citations
5,023 Views
18 Pages

Differential Aquaporin Response to Distinct Effects of Two Zn Concentrations after Foliar Application in Pak Choi (Brassica rapa L.) Plants

  • Hamideh Fatemi,
  • Chokri Zaghdoud,
  • Pedro A. Nortes,
  • Micaela Carvajal and
  • Maria del Carmen Martínez-Ballesta

24 March 2020

Zinc (Zn) is considered an essential element with beneficial effects on plant cells; however, as a heavy metal, it may induce adverse effects on plants if its concentration exceeds a threshold. In this work, the effects of short-term and prolonged ap...

  • Article
  • Open Access
10 Citations
4,175 Views
16 Pages

Root−to−Shoot Signaling and Leaf Water−Use Efficiency in Peach Trees under Localized Irrigation

  • Evangelos Xylogiannis,
  • Adriano Sofo,
  • Bartolomeo Dichio,
  • Giuseppe Montanaro and
  • Alba N. Mininni

23 March 2020

Global climate change is affecting important natural resources including water. Increasing temperature will change rate of evaporation and transpiration, leading to variations in water availability, ground water recharge, and water consumption by pla...

  • Article
  • Open Access
27 Citations
5,696 Views
17 Pages

Genetic Variability of Eggplant Germplasm Evaluated under Open Field and Glasshouse Cropping Conditions

  • Nur Nadzirah Mat Sulaiman,
  • Mohd Y. Rafii,
  • Janejira Duangjit,
  • Shairul Izan Ramlee,
  • Chalermpol Phumichai,
  • Yusuff Oladosu,
  • Debi Rani Datta and
  • Ibrahim Musa

23 March 2020

Knowledge of agro-morphological genetic variation and cropping conditions on vegetative and yield-related traits plays a significant role in varietal improvement and production of eggplant (Solanum melongena L.). Following this premise, the current s...

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Agronomy - ISSN 2073-4395