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Embracing smart irrigation management techniques empowers growers to irrigate with greater efficiency, thereby promoting sustainable agricultural production. In this context, growers often rely on crop evapotranspiration (ETc) as a key factor in making informed irrigation decisions, underscoring the significance of accurately determining and spatially mapping crop water status. Technological progress, exemplified by the emergence of unmanned aerial vehicles (UAVs), has brought about a revolutionary shift in agricultural monitoring. UAV platforms can capture high-resolution images with centimeter-level spatial accuracy and offer higher temporal coverage compared to satellite imagery. Considering these advancements, this study introduces a robust method for classifying water stress in cotton using a compact UAV platform and convolutional neural networks (CNN). The experiment was conducted at the USDA-ARS Cropping Systems Research Laboratory (CSRL) in Lubbock, Texas, where the cotton field was divided into 12 drip zones. The study included three replications to evaluate four irrigation treatments: “rainfed”, “full irrigation”, “percent deficit of full irrigation”, and “time delay of full irrigation”. The results demonstrated that the CNN model successfully classified the cotton water stress using the UAV-based RGB image, achieving an overall best prediction accuracy of approximately 91%. By segmenting the original cotton images into separate canopy and soil areas using morphological image processing methods, the authors also isolated and analyzed the individual contributions of these components to cotton water stress. Additionally, a random forest classifier revealed the relative importance of different image features in the classification process through feature importance analysis. These findings highlighted the state-of-the-art performance of the proposed system in cotton water stress classification and provided valuable insights into the key image features contributing to accurate classification. The authors concluded that integrating UAV-based RGB imagery and CNN models had great potential for assessing water stress in cotton.

A new approach to measure spatial variability of soil parameters and field technique to test-value specific fertilizer

Information on the distribution of soil properties is important to know the status of nutrients in the soils based on which fertilizer nutrients are recommended. Given the variability of nutrients in the soils, making a site-specific fertilizer recommendation seems to be a compelling work. To determine the spatial variability of soil nutrients and to make judicious and precise fertilizer recommendations, new measures are designed with this study. These measures are tested against the soil samples (n = 43) for total nitrogen (N), organic matter (OM), phosphorus (P2O5), and potassium (K2O) in the study area. The descriptive statistical analysis indicated an average of low nitrogen and organic matter, while phosphorus was found to be very high and the level of potassium was high. The spread of nutrients across the data sets, however, included low, medium, high, and very high levels of ratings. The Deviation Square Index was developed and applied for the variability measurement and found that the largest variation was with phosphorus distribution, followed by potassium, nitrogen, and organic matter. The coefficient of variation (CV%) analysis also exhibited similar trends in nutrient distributions. Nitrogen was the main determinant explaining the variations in rice yield, while phosphorus and potash were negatively related to the yield. An index of fertilizer nutrient recommendation called Test-Value Specific Dose (TVSD) was developed and used to calculate the nutrient recommendation for each sampled location. This new method gave easy and more accurate doses of fertilizer over the blanket recommendation to fit the variations across the soil samples.

Operation performance test and analysis of 4GQ–1C sugar-cane harvester

Weifeng Huang, Bosheng Zeng, Jianlin Mo, Zizeng Yang, Dejun Meng

Article ID: 2050
Vol 2, Issue 1, 2021

DOI: https://doi.org/10.54517/ama.v2i1.2050
VIEWS - 1589 (Abstract)

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Abstract

4GQ-1C sugarcane harvester was designed to solve the current problems that large and medium-sized sugarcane harvesters had low adaptability in sloping, small row spacing, and small plots of sugarcane harvesting. In order to verify the adaptability and reliability of 4GQ-1C sugarcane harvester, field tests were carried out and compared with existing models. Results showed that the 4GQ-1C sugarcane harvester has good operation performance with a lower impurity rate and loss rate of sugarcane, stronger harvesting adaptability in small row spacing areas, and is more convenient in collecting sugarcane compared with sugarcane harvesters with power of 132 and 194 kw. Furthermore, 4GQ-1C sugarcane harvester is compact and flexible, with good adaptability and a good harvest effect in sugarcane growing areas with small and medium-sized planting scales, making it worth popularizing and applying to sugarcane harvest.

Keywords

sugarcane; harvester; operation performance; field test

References

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13. Huang WF, Zeng BS, Mo JL, et al. Comparative experiment research of mechanized harvesting on newly planted cane and ratoon cane. Modern Agriculture Equipment 2020; 41(4): 27–32.

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Prof. Zhengjun Qiu

Zhejiang University, China

Honorary Editor-in-Chief

Cheng Sun

Academician of World Academy of Productivity Science; Executive Chairman, World Confederation of Productivity Science China Chapter, China

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