scholarly journals USE OF SCALED SEMIVARIOGRAMS IN THE PLANNING SAMPLE OF SOIL CHEMICAL PROPERTIES IN SOUTHERN AMAZONAS, BRAZIL

2015 ◽  
Vol 39 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Ivanildo Amorim de Oliveira ◽  
Milton César Costa Campos ◽  
José Marques Junior ◽  
Renato Eleotério de Aquino ◽  
Daniel de Bortoli Teixeira ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Spherical Model ◽  
Exponential Model ◽  
Soil Samples ◽  
Soil Chemical Properties ◽  
Sampling Density ◽  
Sugarcane Crop ◽  
Lack Of Information ◽  
Set Up ◽  
Almost All

The lack of information concerning the variability of soil properties has been a major concern of researchers in the Amazon region. Thus, the aim of this study was to evaluate the spatial variability of soil chemical properties and determine minimal sampling density to characterize the variability of these properties in five environments located in the south of the State of Amazonas, Brazil. The five environments were archaeological dark earth (ADE), forest, pasture land, agroforestry operation, and sugarcane crop. Regular 70 × 70 m mesh grids were set up in these areas, with 64 sample points spaced at 10 m distance. Soil samples were collected at the 0.0-0.1 m depth. The chemical properties of pH in water, OM, P, K, Ca, Mg, H+Al, SB, CEC, and V were determined at these points. Data were analyzed by descriptive and geostatistical analyses. A large part of the data analyzed showed spatial dependence. Chemical properties were best fitted to the spherical model in almost all the environments evaluated, except for the sugarcane field with a better fit to the exponential model. ADE and sugarcane areas had greater heterogeneity of soil chemical properties, showing a greater range and higher sampling density; however, forest and agroforestry areas had less variability of chemical properties.

scholarly journals Spatial variability of soil chemical properties after coffee tree removal

2009 ◽  
Vol 33 (5) ◽  
pp. 1507-1514 ◽  
Author(s):  
Sidney Rosa Vieira ◽  
Osvaldo Guedes Filho ◽  
Márcio Koiti Chiba ◽  
Heitor Cantarella
Keyword(s):  
Spatial Variability ◽  
Spatial Dependence ◽  
Crop Yields ◽  
Management Strategies ◽  
Chemical Properties ◽  
Spherical Model ◽  
Soil Chemical Properties ◽  
Kriging Interpolation ◽  
Geostatistical Methods ◽  
Plant Removal

Assessing the spatial variability of soil chemical properties has become an important aspect of soil management strategies with a view to higher crop yields with minimal environmental degradation. This study was carried out at the Centro Experimental of the Instituto Agronomico, in Campinas, São Paulo, Brazil. The aim was to characterize the spatial variability of chemical properties of a Rhodic Hapludox on a recently bulldozer-cleaned area after over 30 years of coffee cultivation. Soil samples were collected in a 20 x 20 m grid with 36 sampling points across a 1 ha area in the layers 0.0-0.2 and 0.2-0.4 m to measure the following chemical properties: pH, organic matter, K+, P, Ca2+, Mg2+, potential acidity, NH4-N, and NO3-N. Descriptive statistics were applied to assess the central tendency and dispersion moments. Geostatistical methods were applied to evaluate and to model the spatial variability of variables by calculating semivariograms and kriging interpolation. Spatial dependence patterns defined by spherical model adjusted semivariograms were made for all cited soil properties. Moderate to strong degrees of spatial dependence were found between 31 and 60 m. It was still possible to map soil spatial variability properties in the layers 0-20 cm and 20-40 cm after plant removal with bulldozers.

scholarly journals Soil Chemical Properties under Conservation Agriculture and Cereal-Based Cropping System in Eastern Tarai of Nepal

2020 ◽  
Vol 6 ◽  
pp. 115-126
Author(s):  
Shukra Raj Shrestha ◽  
Jiban Shrestha ◽  
Sanjeet Kumar Jha ◽  
Dinesh Khadka ◽  
Prakash Paneru ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Cropping System ◽  
Conservation Agriculture ◽  
Conventional Tillage ◽  
Soil Samples ◽  
Kidney Bean ◽  
Soil Chemical Properties ◽  
Available Phosphorus ◽  
Zero Tillage ◽  
Total N

Field experiments were conducted for four years (2014-2017) at five locations namely Salbani, Bhokraha, Simariya, Bhaluwa and Kaptanganj of Sunsari district to assess the changes in soil chemical properties under conservation agriculture (CA)-based practices in two cropping systems namely rice-kidney bean-maize at Salbani and rice-wheat at rest of the locations. In rice-wheat cropping system, there were four treatments: (1) conventional tillage (CT) for rice transplantation and subsequent wheat sowing, (2) conventional tillage rice transplantation followed by zero tillage (ZT) wheat, (3) unpuddled rice transplantation followed by zero tillage wheat, (4) zero tillage in both rice and wheat. Similarly, in rice-kidney bean-maize cropping system, there were four treatments; (1) conventional tillage for rice transplantation and sowing of both kidney bean and maize, (2) conventional tillage rice transplantation followed by zero tillage in both kidney bean and maize, (3) unpuddled rice transplantation followed by zero tillage in both kidney bean and maize, (4) zero tillage in all three crops. Soil samples were taken at initial and every year after rice harvest.The soil samples were analyzed for total nitrogen, available phosphorus, available potassium, pH and soil organic matter.Total nitrogen (N) showed a slightly decreasing trend in the first three years and showed a slight increase at the end of experiment under ZT in all locations. The total N under ZT changed from 0.12 to 0.13%, 0.05 to 0.06%, 0.10 to 0.12%, 0.11 to 0.08% and 0.09 to 0.13% in Salbani, Bhokraha, Simariya, Bhaluwa and Kaptanganj, respectively.  All locations showed the positive values of available potassium; Salbani  revealing considerable change of 64.3 to 78.5 mg/kg in CT while 68.4 to 73.3 mg/kg in ZT condition. The treatment where rice was transplanted in unpuddled condition and zero tilled to wheat, had a mean value of available phosphorus and potassium as 87.3 and 81.9 mg/kg respectively. Soil pH ranged from 4.8 to 7.1 in CT while it was 5.2 to 6.8 in ZT across the locations. The change in soil organic matter in CT of all locations except Salbani was narrower as compared to ZT.

scholarly journals SPACIAL VARIABILITY AND SAMPLING DENSITY OF CHEMICAL ATTRIBUTES IN ARCHAEOLOGICAL BLACK EARTH AND NATIVE FOREST SOIL IN MANICORÉ, AM

FLORESTA ◽  
2014 ◽  
Vol 44 (4) ◽  
pp. 735 ◽  
Author(s):  
Ivanildo Amorim de Oliveira ◽  
José Marques Júnior ◽  
Milton César Costa Campos ◽  
Renato Eleotério de Aquino ◽  
Diego Silva Siqueira ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Forest Soil ◽  
Soil Samples ◽  
Spatial Behavior ◽  
Statistical Techniques ◽  
Native Forest ◽  
Sampling Density ◽  
Lack Of Information ◽  
Chemical Attributes ◽  
Regular Spacing

AbstractConsidering the lack of information about spatial behavior of the soil attributes in areas of archaeological black earth and native forest, the objective of this study was to evaluate the spatial variability of chemical attributes and determine the sampling density in soil with archaeological black earth and native forest in the region of Manicoré, AM. The study was conducted in a rural property located in the community of Santo Antônio do Matupi, at the margins of BR 230, Trans-amazon highway, in the region of Manicoré, AM. In these areas were established grids of 70 m x 70 m, with regular spacing of 10 x 10 m, totaling 64 points, then soil samples were collected at a depth of 0.0-0.20 m and 0 , 40 - 0,60 m. Chemical attributes were determined (pH, OM, P, K, Ca, Mg, SB, CTC, V% and H + Al). Data were analyzed using descriptive statistical techniques and geostatistics. Sampling density was determined basing on CV and on the range of the semivariograms. It was verified that the studied attributes showed spatial variability and the area of archaeological black earth presented greater spatial variability than the native forest. Its greater sampling density was determined basing on the range of the adjusted semivariograms.Keywords: Indian black earth; attributes of soil; geostatistics. 

scholarly journals Interactions between leaf macronutrients, micronutrients and soil properties in pistachio (Pistacia vera L.) orchards

2013 ◽  
Vol 72 (2) ◽  
pp. 295-310 ◽  
Author(s):  
Prodromos Koukoulakis ◽  
Christos Chatzissavvidis ◽  
Aristotelis Papadopoulos ◽  
Dimitrios Pontikis
Keyword(s):  
Dry Matter ◽  
Chemical Properties ◽  
Nutrient Status ◽  
Soil Chemical Properties ◽  
Leaf Analysis ◽  
Promote Plant Growth ◽  
Macro And Micronutrients ◽  
Almost All ◽  
Plant Available P ◽  
Pistachio Trees

Abstract - The interactions between: (i) leaf dry matter macronutrietns, micronutrients and soil chemical properties, (ii) leaf macro- and micronutrients, (iii) soil macro- and micronutrients and (iv) soil chemical properties, and soil micro- and macronutrients in 50 pistachio orchards were investigated in leaves and soils by means of regression analysis. Most of the soils were deficient in plant-available P, Zn, Mn, Fe, and B, while they were excessively supplied with Cu. Leaf analysis showed that most of the trees were sufficient in K, Mg, Mn and B, but deficient in N, P and Fe, and excessive in Zn and Cu. It was found that almost all the significant elemental interactions occurring in pistachio leaves or soils were synergistic, contributing considerable quantities of available nutrients and, therefore, improving the nutrient status of pistachio trees, and the level of soil fertility. On the other hand, the interactions between K and Mg in leaves, and between soil pH and leaf N or soil Fe, Mn and B, were antagonistic. It is suggested that these results must be taken into account during fertilization of pistachio trees, in order to avoid nutritional disorders and to promote plant growth, productivity and nut quality.

THE INFLUENCE OF BURNING ON THE SOIL IN THE TIMBER RANGE AREA OF LAC LE JEUNE, BRITISH COLUMBIA: II. CHEMICAL PROPERTIES

1959 ◽  
Vol 39 (1) ◽  
pp. 6-11 ◽  
Author(s):  
J. D. Beaton
Keyword(s):  
Organic Matter ◽  
Phosphorus Content ◽  
Carbonic Acid ◽  
Chemical Properties ◽  
Calcium Content ◽  
Soil Samples ◽  
Soil Chemical Properties ◽  
Organic Layer ◽  
Mineral Layer ◽  
Soluble Calcium

The effects of fire on certain soil chemical properties were investigated on soil samples taken from the surface organic layer (O horizon) and the immediately underlying leached mineral layer (A2 horizon) from seven different burns and from corresponding unburned areas present within each burned-over area. Burning resulted in an increase in the pH, total phosphorus content, and CO2-soluble calcium content of the O horizon of most of the soils studied. As a consequence of fire, the O horizon was reduced in organic matter, total nitrogen and carbonic acid-soluble phosphorous and magnesium. Most of the effects of fire upon soil chemical properties were apparently restricted to the O horizon since no significant trends were evident in the underlying A2 horizon.

scholarly journals Gamma Irradiation with 50 kGy Has a Limited Effect on Agronomic Properties of Air-Dry Soil

Soil Systems ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 28
Author(s):  
J. Bernhard Wehr ◽  
Gunnar Kirchhof
Keyword(s):  
Gamma Irradiation ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Soil Samples ◽  
Soil Chemical Properties ◽  
Total Carbon ◽  
Conflicting Information ◽  
Two Samples ◽  
Carbon And Nitrogen Content ◽  
Induced Changes

International collaboration on agronomy projects often requires the shipment of soil samples between countries to conduct analyses. However, quarantine regulations in numerous countries restrict the importing of soil samples unless they are sterilized, or analysis is carried out only in quarantine facilities, which greatly increases cost. Yet, sterilization is only an option if it does not change the soil properties. There is conflicting information about the effect of irradiation on soil chemical properties. To assess the effect of gamma irradiation on some soil chemical properties, one hundred randomly selected air-dried (40 °C) soil samples were split into two samples. One sample was left untreated and the other sample was irradiated with 50 kGy as prescribed by Australian biosecurity regulations. Commonly measured agronomic soil chemical properties were then measured and results from the non-irradiated samples were compared to the irradiated samples. The results show no effect of irradiation on soil cation exchange capacity, exchangeable cations, total carbon and nitrogen content, and DTPA-extractable Zn. Small (<5%) but statistically significant effects of irradiation were observed for pH (1:5 water), electric conductivity (EC1:5), DTPA-extractable Cu, Fe and Mn, and Colwell P. The irradiation effects on Fe were greater in the topsoil than subsoil. Considering that irradiation-induced changes to soil chemical properties were below 5%, gamma irradiation can be considered a suitable method to sterilize air-dried soil to meet import requirements, without affecting the interpretation of soil fertility reports.

scholarly journals Availibility of P, K in paddy Land Under Organic application

2018 ◽  
Vol 5 (3) ◽  
pp. 434-440
Author(s):  
Fitra Syawal Harahap ◽  
Abdul Rauf ◽  
Benny Hidayat ◽  
Hilwa Walida ◽  
Jamidi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Fertility ◽  
Chemical Properties ◽  
Soil Samples ◽  
Paddy Fields ◽  
Soil Chemical Properties ◽  
Phosphorus Fertilization ◽  
Fertility Status ◽  
Review Management ◽  
Soil Fertility Status

Organic materials in situ remaining paddy crops in paddy fields are much abandoned by farmers. Most of the remaining harvested are burned, stacked in the cultivated, or used for animal feed or as a fungus. Straw compost is source of Potassium (K) and Silica (Si). About 80% of K absorbed by plants is in the straw. The return of straw to the soil may slow the impoverishment of Potassium (K) in the soil. This study aims to find out how the availability of phosphorus (P) and potassium (K) nutrients by giving organic matter as soil fertility status in paddy fields in Beringin Subdistrict, Deli Serdang Regency and to review management alternatives that are in accordance with the soil fertility status in the Central Land Rice fields in Beringin Subdistrict, Deli Serdang Regency. This research was carried out in the Central Rice Field in Beringin Subdistrict, Deli Serdang Regency ± 11 meters above sea level. The taking of soil samples was taken in the upper layer at the top soil depth of 0-20 cm, 20-40 cm and the coordinates were recorded using GPS (Global Positioning System). While information on land management is obtained by direct observation in the field and in-depth interviews with farmers in snow ball which aims to obtain complete information from farmers. Soil samples that have been taken in the field are then analyzed in the laboratory. Soil chemical properties analyzed in laboratory soil chemical properties analyzed at P2O5 Bray II (ppm) laboratory K2O Hcl 25% (mg / 100g). To determine the chemical properties of soil with certain criteria that have been determined. Based on Technical Guidelines for Evaluation of Soil Fertility The direction of management of soil fertility needs to be added to organic matter and phosphorus fertilization regularly so that soil fertility can be sustainable. Further research is needed in order to find out the addition of phosphorus fertilizer and organic matter in each unit of land.

scholarly journals Soil chemical properties influence abundance of nematode trophic groups and Ralstonia solanacearum in high tunnel tomato production

2019 ◽  
Vol 2 ◽  
pp. 3 ◽  
Author(s):  
Daisy Chepkoech Ngeno ◽  
Lucy Kananu Murungi ◽  
Davis Ireri Fundi ◽  
Vitalis Wekesa ◽  
Solveig Haukeland ◽  
...  
Keyword(s):  
Soil Ph ◽  
Negative Correlation ◽  
Ralstonia Solanacearum ◽  
Chemical Properties ◽  
Soil Samples ◽  
Soil Chemical Properties ◽  
Parasitic Nematodes ◽  
Strong Positive Correlation ◽  
Tomato Production ◽  
High Tunnels

Background: Plant parasitic nematodes (PPNs) and bacterial wilt (Ralstonia solanacearum) are serious soil-borne pests in tomato (Solanum lycopersicon L) production in high tunnels. This study was undertaken to determine effects of soil chemical properties on their abundance. Method: Soil samples were collected from 32 high tunnels in the sub-counties: Gatundu North, Gatundu South, Juja, Thika, Ruiru and Kiambu, Kenya, from January to November 2016. Nematodes genera, R. solanacearum and soil chemical properties were evaluated from composite soil samples collected from the high tunnels. Results: The soil pH and N, P, K, Ca, Mg, Na and Cu varied across sub-counties. Twenty-four nematode genera including 14 PPNs, 5 bacterivores, 3 fungivores and 2 predators were recovered from soil samples. The genera Meloidogyne, Alaimus, Aporcelaimus and Mononchus were the most abundant PPNs, bacterivores, fungivores and predators, respectively, and differed across sub-counties. The abundance of Meloidogyne spp. and R. solanacearum was higher in Gatundu North than in the other sub-counties. There was a strong, positive correlation between Meloidogyne spp. (second stage juveniles counts) population and R. solanacearum (cfu∙mL-1) with soil N and P, and a weak negative correlation with soil pH, EC, Zn and Cu. Fungal feeders exhibited a strong negative correlation with soil pH and Ca; predators, bacterial feeders, and PPNs had similar correlations with N, P and Ca, respectively. Conclusion: Soil chemical properties affect abundance of beneficial and phytoparasitic nematodes and R. solanacearum, which varies with location.

Changes in soil chemical properties under long-term sugar cane monoculture and their possible role in sugar yield decline

Soil Research ◽  
1996 ◽  
Vol 34 (6) ◽  
pp. 967 ◽  
Author(s):  
RGV Bramley ◽  
N Ellis ◽  
RO Nable ◽  
AL Garside
Keyword(s):  
Sugar Cane ◽  
Soil Chemistry ◽  
Property Values ◽  
Chemical Properties ◽  
Soil Samples ◽  
Sugar Yield ◽  
Soil Chemical Properties ◽  
Soil Factors ◽  
Yield Decline

Soil samples from paired 'old' and 'new' sugar cane soils from 6 contrasting sites in 3 climatically contrasting areas of North Queensland were analysed to identify changes in soil chemistry resulting from continuous sugar cane monoculture. The aim was to identify soil factors that may be associated with, or act as triggers to, the expression of sugar yield decline. It was found that there was no consistent effect of time under sugar monoculture on soil chemical properties across all sites, when either the distributions of properties through the soil profile, or property values at specific depths, were considered. However, marked effects were noted at some sites with respect to some soil properties, and the lack of consistent results across all sites may therefore be attributable to the inherent differences between the soils sampled. These effects were generally consistent with soil acidification.

scholarly journals Assessment and Distribution of Macro and Micro Nutrients in Different Soil Series of District Swabi, Khyber Pakhtunkhwa, Pakistan

2018 ◽  
Vol 2 ◽  
pp. 23-32 ◽  
Author(s):  
Aftab Jamal ◽  
Hifsa Jamal
Keyword(s):  
Green Manure ◽  
Surface Soil ◽  
Chemical Properties ◽  
Soil Samples ◽  
Potassium Deficiency ◽  
Soil Series ◽  
Fertility Status ◽  
Soil Fertility Status ◽  
Almost All ◽  
Extractable Zn

In order to investigate the soil fertility status of Swabi district the present research was carried out. A total of 32 soil samples were collected from 16 different locations surrounding Swabi area at 0-20cm and 20-40cm depths and analyzed for different chemical properties and fertility status in the laboratory of soil and environmental Sciences University of Agriculture Peshawar. Results revealed that soil of Swabi was moderately to strongly calcareous in nature and alkaline in reaction. The O.M content was found deficient to marginal, being deficient in 75% and marginal in 25% samples at both soil depths. AB-DTPA Extractable phosphorous was found sufficient (40%) at surface soil while at sub surface it was found 15% deficient. No potassium deficiency was observed at surface as well as at sub surface soil, being sufficient in 37 % samples at surface soil and 43 % samples at sub surface soil. AB-DTPA extractable Cu was found adequate in almost all soil samples, Fe was found sufficient in 78% soil samples and medium in 9% samples and was found low in 12% soil samples at both soil depths. AB-DTPA Extractable Zn was found 12% deficient, 6% medium and 31% adequate at all surface soil samples while at sub surface it was found 19% deficient, 22% medium and 12% adequate. Proper fertilization and application of FYM and green manure is highly recommended for the areas low in Organic matter and respective nutrients.

Sign in / Sign up

Export Citation Format

Share Document