Management zone delineation based on soil properties measured during the reproductive stage of rice in the field

2021 ◽  
Author(s):  
Mingming Wang ◽  
Ehsan Tavakkoli ◽  
Pichu Rengasamy ◽  
Lihua Huang ◽  
Hongyuan Ma ◽  
...  
Keyword(s):  
Soil Properties ◽  
Reproductive Stage ◽  
Management Zone

scholarly journals Delineation of irrigation management zones in a Quartzipsamment of the Brazilian semiarid region

2016 ◽  
Vol 51 (9) ◽  
pp. 1283-1294 ◽  
Author(s):  
Henrique Oldoni ◽  
Luís Henrique Bassoi
Keyword(s):  
Soil Properties ◽  
Clustering Algorithm ◽  
Irrigation Management ◽  
Optimal Number ◽  
Semiarid Region ◽  
Management Zones ◽  
Distribution Maps ◽  
Management Zone ◽  
Brazilian Semiarid ◽  
Fuzzy C Means Clustering

Abstract The objective of this work was to delineate irrigation management zones using geostatistics and multivariate analysis in different combinations of physical and hydraulic soil properties, as well as to determine the optimal number of management zones in order to avoid overlaping. A field experiment was carried out in a Quartzipsamment, for two years, in an irrigated orchard of table grape, in the Senador Nilo Coelho Irrigation Scheme, in the municipality of Petrolina, in the state of Pernanbuco, Brazil. Soil samples were collected for the determination of soil physico-hydraulic properties. A portable meter was used to measure soil apparent electrical conductivity. Spatial distribution maps were generated using ordinary kriging. Management zones for five different combinations of soil properties were defined using the fuzzy c-means clustering algorithm, and two indexes were applied to determine the optimal number of management zones. Two combinations of soil properties can be used in the management zone planning in order to monitor soil moisture.

scholarly journals Rice husk biochar effects on improving soil properties and root development in rice (Oryza glaberrima Steud.) exposed to drought stress during early reproductive stage

2021 ◽  
Vol 6 (2) ◽  
pp. 737-751
Author(s):  
Kartika Kartika ◽  
◽  
Jun-Ichi Sakagami ◽  
Benyamin Lakitan ◽  
Shin Yabuta ◽  
...  
Keyword(s):  
Drought Stress ◽  
Soil Properties ◽  
Rice Husk ◽  
Root Development ◽  
Reproductive Stage ◽  
Oryza Glaberrima ◽  
Rice Husk Biochar

Interactions between landscape defined management zones and grazing management systems

2017 ◽  
Vol 8 (2) ◽  
pp. 787-791 ◽  
Author(s):  
E. M. Pena-Yewtukhiw ◽  
D. Mata-Padrino ◽  
J. H. Grove
Keyword(s):  
Soil Properties ◽  
Bulk Density ◽  
Weather Conditions ◽  
Soil Strength ◽  
Forage Yield ◽  
Grazing Management ◽  
Weather Extremes ◽  
Near Surface ◽  
Management Zones ◽  
Management Zone

Yield and landscape are commonly used to guide management zone delineation. However, production system choice and management can interact with landscape attributes and weather. The objective of this study was to evaluate forage yield and soil properties in three landscape defined (elevation based) management zones, and under two different grazing systems. Changes in soil properties (soil strength, bulk density, moisture, bioavailable nutrients) and forage productivity (biomass), as related to grazing management and management zone, were measured. Bulk density, moisture, and forage biomass were greater at higher elevation. Soil strength decreased as elevation increased, and was greater near-surface after winter grazing ended. The response of landscape delineated management zones varied with extreme weather conditions and treatment. Lower zones were more sensitive to weather extremes than higher elevations, directly affecting biomass accumulation. In conclusion, we observed interactions between the grazing treatments and the management zones.

Applying the Method of Lagrange Multipliers to Derive an Estimator for Unsampled Soil Properties

2014 ◽  
Vol 11 (1) ◽  
pp. 15
Author(s):  
Set Foong Ng ◽  
Pei Eng Ch’ng ◽  
Yee Ming Chew ◽  
Kok Shien Ng
Keyword(s):  
Soil Properties ◽  
Lagrange Multipliers ◽  
Unbiased Estimator ◽  
Soil Property ◽  
Minimum Variance ◽  
Distance Method ◽  
True Value ◽  
A Site ◽  
Method Of Lagrange Multipliers ◽  
Inverse Distance

Soil properties are very crucial for civil engineers to differentiate one type of soil from another and to predict its mechanical behavior. However, it is not practical to measure soil properties at all the locations at a site. In this paper, an estimator is derived to estimate the unknown values for soil properties from locations where soil samples were not collected. The estimator is obtained by combining the concept of the ‘Inverse Distance Method’ into the technique of ‘Kriging’. The method of Lagrange Multipliers is applied in this paper. It is shown that the estimator derived in this paper is an unbiased estimator. The partiality of the estimator with respect to the true value is zero. Hence, the estimated value will be equal to the true value of the soil property. It is also shown that the variance between the estimator and the soil property is minimised. Hence, the distribution of this unbiased estimator with minimum variance spreads the least from the true value. With this characteristic of minimum variance unbiased estimator, a high accuracy estimation of soil property could be obtained.

AVAILABLE WAYS TO OPTIMIZE SOIL PROPERTIES IN APPLE ORCHARDS

2020 ◽  
Vol 16 (2) ◽  
pp. 41-63
Author(s):  
V.L. Zakharov ◽  
◽  
G.N. Pugachev ◽  
Keyword(s):  
Soil Properties ◽  
Apple Orchards

Geospatial comparison of three models to predict soil properties in semi-humid region of West Bengal, India

2018 ◽  
Vol 32 (5) ◽  
pp. 37
Author(s):  
Rajaram Majhi ◽  
Gouri Sankar Bhunia ◽  
Tapan Kumar Das ◽  
Pravat Kumar Shit ◽  
Rabindranath Chattopadhyay
Keyword(s):  
Soil Properties ◽  
West Bengal ◽  
Humid Region

CORRELATION RELATIONS BETWEEN VALUABLE IRRIGATED SOIL PROPERTIES AND PLANT PRODUCTIVITY

2020 ◽  
Vol 5 (2) ◽  
pp. 37-42
Author(s):  
Inobat Ruzieva ◽  
◽  
Inobat Ruzieva ◽  
Islom Xaitov ◽  
Ulug`berdi Xursanov
Keyword(s):  
Soil Properties ◽  
Plant Productivity

AN ASSESSMENT OF BOTTOM SEDIMENT AS A SOURCE OF PLANT NUTRIENTS AND AN AGENT FOR IMPROVING SOIL PROPERTIES

2019 ◽  
Vol 18 (8) ◽  
pp. 1647-1656 ◽  
Author(s):  
Agnieszka Baran ◽  
Marek Tarnawski ◽  
Magdalena Urbaniak
Keyword(s):  
Bottom Sediment ◽  
Soil Properties ◽  
Plant Nutrients
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