Estimation of plant available potassium in loamy soils by extraction with magnesium sulfate solution

The aim of the study. To find a method to estimate plant available potassium for soil testing that does not require expensive flame photometry or atomic absorption spectrometry. Location and time of the study. Southern parts of West and Central Siberia, 2016-2019. Methodology. Comparison the potassium pool, extractable by 0,1M MgSO4 solution, with exchangeable potassium, extractable by 1M NH4OAc solution (according to GOST 26210-91) by regression analysis of the contents in 100 soil samples of arable soils (Luvic, Haplic and Calcic Chernozems, and Luvic Phaeozems) with different granulometric composition. Results. Exchangeable potassium showed the best correlation with the uptake of the element by plants and with yield in a variety of soil and climatic conditions. It was found that the relationship between potassium availability indices KAIAc (potassium extracted by 1M NH4OAc) and KAIMg (potassium extracted by 0,.1M MgSO4) was satisfactorily described (R2 = 0.88) by a simple linear function for soils with texture classes from sandy loam to sandy/silty clay and well described (R2 = 0.92) by a power function for silt loam, clay loam and sandy/silty clay. In 81% of the soils surveyed the difference between the calculated (according to the power equation) and actual KAIAc values was no more than 20%, and for 97% of the studied soils it did not exceed 30%. The cost of analytical equipment required for potassium analysis for soil testing is 7-60 times lower for KAIMg determination as compared with KAIAc. Conclusions. The KAIMg potassium availability index can be used alongside the standard KAIAc availability index for soils with soil texture classes from silt loam to sandy/silty clay. Conversion of KAIMg into KAIAc can be made by the following formula: KAIAc = 8,.108 • KAIMg0,793.

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Influence of Various Soil Properties on the Adsorption and Desorption of ICIA-0051 in Five Soils

Weed Technology ◽

10.1017/s0890037x00035831 ◽

1992 ◽

Vol 6 (3) ◽

pp. 583-586 ◽

Cited By ~ 10

Author(s):

John S. Wilson ◽

Chester L. Foy

Keyword(s):

Sandy Loam ◽

Clay Content ◽

Silty Clay ◽

Silt Loam ◽

Clay Loam ◽

Soil Factors ◽

Silty Clay Loam ◽

Freundlich Equation ◽

General Order ◽

Highly Correlated

The soil organic matter and/or humic matter fraction was highly correlated with the adsorption of ICIA-0051 herbicide onto five soils; clay content and other soil factors were less correlated. The Freundlich equation was used to describe the adsorption of ICIA-0051 by the various soils. Based on the K constants, the general order for adsorption for each soil was Hyde silty clay loam > Frederick silt loam > Davidson clay = Bojac sandy loam > Appling loamy sand. Across all soils, 25 to 50% of the amount adsorbed was removed by two desorptions. Appling, Bojac, and Davidson soils retained less herbicide after two desorptions than did Frederick and Hyde.

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Simulating the vertical transition of soil textural layers in north-western China with a Markov chain model

Soil Research ◽

10.1071/sr12332 ◽

2013 ◽

Vol 51 (3) ◽

pp. 182 ◽

Cited By ~ 14

Author(s):

Danfeng Li ◽

Ming'an Shao

Keyword(s):

Layer Thickness ◽

Sandy Loam ◽

Loamy Sand ◽

Silty Clay ◽

Silt Loam ◽

Clay Loam ◽

Silty Clay Loam ◽

Textural Type ◽

Log Normal ◽

Log Normal Distribution

The heterogeneity of textures in soil profiles is important for quantifying the movement of water and solutes through soil. Soil-profile textures to a depth of 300 cm were investigated at 100 sites in a 100-km2 area in the central region of the Heihe River system, where oases coexist with widespread deserts and wetland. The probability distribution of textural-layer thickness was quantified. The vertical transition of the soil textural layers was characterised by a Markov chain–log-normal distribution (MC-LN) model based on the probability of one textural type transitioning to another. Nine types of textural layers were observed: sand, loamy sand, sandy loam, silt loam, loam, clay loam, silty clay loam, silty clay, and clay. Sand was the most frequent in the profiles, whereas silt loam and clay were rare. The layers of sand and silty clay were relatively thick, and the layers of loam and clay were relatively thin. The coefficients of variation ranged from 36–87%, indicating moderate variation in the layer thickness of each textural type. The soil profile was characterised as a log-normal distribution. A χ2 test verified the Markov characteristic and the stability of the vertical change of soil textural layers. Realisations of the soil textural profiles were generated by the MC-LN model. A Monte Carlo simulation indicated that the simulated mean layer thickness of each textural type agreed well with the corresponding field observations. Element values of the transition probability matrix of the textural layers simulated by the MC-LN model deviated <12.6% from the measured values, excluding the data from the layers of clay and silt loam. The main combinations of upper to lower textural layers in the study area were loamy sand and sand (or sandy loam), sandy loam and sand (or loamy sand and loam), loam and clay loam, clay loam (or silty clay) and silty clay loam, and silty clay loam and silty clay. The MC-LN model was able to accurately quantify the vertical changes of textures in the soil profiles. This study will aid in quantification of water and solute transport in soils with vertical heterogeneity of soil textural layers.

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ANALYSIS OF LAND SUITABILITY FOR DRAGON FRUIT CULTIVATING IN KURANJI DISTRICT PADANG CITY

JURNAL BUANA ◽

10.24036/student.v3i2.434 ◽

2019 ◽

Vol 3 (2) ◽

pp. 428

Author(s):

Risky Wahyudi M ◽

Paus Iskarni ◽

Triyatno .

Keyword(s):

Growth And Development ◽

Sandy Loam ◽

Research Area ◽

Land Suitability ◽

Survey Method ◽

Silty Clay ◽

Silt Loam ◽

Dragon Fruit ◽

Fruit Plants ◽

Research Show

Abstract This research of aims are determine the condition of land characteristics, land suitability for dragon fruit plants in the research area. The method used in the study is a survey method with mapping of land units The research show as follows: 1. land characteristics: a) climate: rainfall 3117.8 mm/year, b) elevation: the criteria are very good because all land units are between 0 - 350 elevation c) slope: divided into three (3) classes namely class is flat, sloping, slightly tilted d) the texture of the soil is sandy loam, sandy clay, loamy sand, silt loam, silty clay, e) ph soil is dominated by a class of very good pH 5-7, f) nitrogen is divided into four (4) classes namely very good, good class, rather ugly class, bad class, g) phosphorus is divided into 3 classes, namely: very good, good class, rather ugly class, h) potassium: all land units have very good potassium class. 2. Land suitability level: all land units in the research location in Kuranji District have a fairly suitable level of suitability or enough potential as a place for growth and development of dragon fruit plants. Keyword: Land suitability, Dragon fruit, Kuranji

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Soil- and land classification in the old coastal plain of Surinam.

Netherlands Journal of Agricultural Science ◽

10.18174/njas.v1i4.17865 ◽

1953 ◽

Vol 1 (4) ◽

pp. 278-298

Author(s):

J.J. Van der Eijk ◽

H.A.J. Hendriks

Keyword(s):

Coastal Plain ◽

Tidal Flat ◽

Aerial Photograph ◽

Sandy Loam ◽

Clay Soils ◽

Silty Clay ◽

Silt Loam ◽

Land Classification ◽

Waterlogged Soils

The old coastal plain consists of isolated, scattered areas of dry or only periodically waterlogged soils. Their total area is 21% of the entire coastal plain. The soils are either sandy loam soils formed on the old offshore bar or silt loam or silty clay soils formed on the old tidal flat. An aerial photograph and a map on a scale of 1: 666, 666 are given and the soils are classified into series. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Influence of soil texture on snowmelt infiltration into frozen soils

Canadian Journal of Soil Science ◽

10.4141/s00-093 ◽

2002 ◽

Vol 82 (1) ◽

pp. 75-83 ◽

Cited By ~ 7

Author(s):

Litong Zhao ◽

D. M. Gray ◽

B. Toth

Keyword(s):

Soil Texture ◽

Agricultural Soils ◽

Sandy Loam ◽

Phase Changes ◽

Silty Clay ◽

Silt Loam ◽

Clay Loam ◽

Silty Clay Loam ◽

Infiltration Process ◽

Frozen Soils

This paper describes the influence of soil texture on snowmelt infiltration into frozen soils. Field data collected on frozen, unsaturated agricultural soils of the Canadian Prairies during snow ablation demonstrate: (a) poor association between the amount of infiltration of meltwater released by the seasonal snowcover and soil texture, and (b) small differences in cumulative amounts among soils of widely different textures. A physics-based numerical simulation of heat and mass transfers with phase changes in frozen soils is used to study the mechanics of the infiltration process in representative clay, silty clay loam, silt loam and sandy loam soils. The results of the simulations show that the differences among cumulative snowmelt infiltration into clay, silty clay loam and silt loam soils after 24 h of continuous infiltration are small. Infiltration into a lighter-textured sandy loam after 24 h was on average 23% higher than in the other three soils with most of the increase occurring in the first 5 h of the simulation. Key Words: Soil texture, snowmelt, infiltration, frozen soils

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Effect of Soil and Climate on Herbicide Dissipation

Weed Science ◽

10.1017/s0043174500031428 ◽

1969 ◽

Vol 17 (2) ◽

pp. 241-245 ◽

Cited By ~ 16

Author(s):

O. C. Burnside ◽

C. R. Fenster ◽

G. A. Wicks ◽

J. V. Drew

Keyword(s):

Soil Texture ◽

Soil Profile ◽

Sandy Loam ◽

Silty Clay ◽

Silt Loam ◽

Clay Loam ◽

Silty Clay Loam ◽

Fine Sandy Loam ◽

Herbicide Residues ◽

Herbicide Residue

The persistence of five herbicides in six soils across Nebraska can be ranked from greatest to least as follows: 5-bromo-3-isopropyl-6-methyluracil (isocil) at 5 and 25 1b/A, 2-chloro-4,6-bis-(isopropylamino)-s-triazine (propazine) at 3 and 9 1b/A, 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine) at 3 and 9 1b/A, trichlorobenzyl chloride (hereinafter referred to as TCBC) at 7 and 49 1b/A, and 3-(3,4-dichlorophenyl)-1-methoxyl-1-methylurea (linuron) at 3 and 9 1b/A. Soil texture differences (sandy loam, very fine sandy loam, silt loam, and silty clay loam) had a greater influence on herbicide residue carryover than did climatic differences across Nebraska during 1962 to 1968. Soil carryover of herbicide residues was greater in coarse rather than fine-textured soils and in the drier regions of western than in eastern Nebraska. Leaching of herbicides into the soil profile was an avenue of herbicide dissipation.

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NITRIFICATION STUDIES WITH SOIL TYPES IN NORTHERN PUERTO RICO

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v19i2.14286 ◽

1969 ◽

Vol 19 (2) ◽

pp. 73-103

Author(s):

Juan Amedee Bonnet

Keyword(s):

Experimental Data ◽

Puerto Rico ◽

Sandy Loam ◽

Soil Samples ◽

Soil Types ◽

Nitrification Rate ◽

Silty Clay ◽

Silt Loam ◽

Clay Loam ◽

Silty Clay Loam

Experimental results have been reported on the nitrification rate of nine soil types from Northern Puerto Rico classified as: Catalina clay, Catalina clay level phase, Coto clay light texture phase, Espinosa clay, Lares clay loam, Mucara silty clay loam, Mucara silt loam, Sabana Seca clay and Toa silt loam. The various soil types are represented by twenty-one different soil samples. Some experimental data is also reported for a soil type from New Jersey classified as Sassafras sandy loam.

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Mycorrhiza Co-Association with Aspilia pruliseta Schweif and Phosphorus Uptake Effects on Growth Attributes of Gadam Sorghum in Selected Sites in Kenya

10.1101/2019.12.19.882100 ◽

2019 ◽

Author(s):

J.P. Muchoka ◽

D.N Mugendi ◽

P.N Njiruh ◽

C.N. Onyari ◽

P.K. Mbugua ◽

...

Keyword(s):

Sandy Loam ◽

Phosphorus Uptake ◽

Mineral Elements ◽

Eastern Region ◽

Silty Clay ◽

Silt Loam ◽

Seed Inoculation ◽

Growth Attributes ◽

The University ◽

Hypocotyl Development

ABSTRACTMycorrhiza fungi are important components of soil microbiota in the rhizosphere and greatly influence uptake of mineral elements to plants. A green house experiment was conducted at the University of Embu. The experiment involved use of sterilized polythene potting material sized 30 cm by 40 cm. The pots were filled two thirds the height of the potting material with soil from a predetermined source in Gakurungu, Tunyai and Kanyuombora in the upper eastern region in Kenya. The soil used in the pots was collected from the rhizosphere of Aspilia pruliseta Schweif vegetation as well as adjacent areas without this vegetation as a control at 0-20 cm, 21-40 cm and 41-60 cm for each of the soil types (silty clay, silt loam and sandy loam) used in the experiment. Two sorghum seeds inoculated with mycorrhiza fungi were planted in each pot and a similar number of pots planted with un inoculated sorghum seeds as a control. Each of the 4 treatments mentioned above, was replicated four times giving n=144. Each pot was watered after every two days using a two-litre watering can for the first one week. Thereafter, watering regime was reduced to once a week but ensuring the pots remained moist. Watering was done uniformly to all the pots. This was maintained for a period of thirty five days. Data was analysed using SAS edition 8.2. Seed emergence, hypocotyl development and stand count were enhanced at P≤0.05 in both mycorrhiza fungi inoculated gadam sorghum seeds and in pots whose soils were taken from the rhizosphere of Aspilia pruliseta plants. The growth attributes had a positive correlation to yield at 95% confidence. Soil phosphate level was enhanced in both cases of gadam seed inoculation with mycorrhiza and in soils previously grown Aspilia pruliseta vegetation.

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Effect of Soil Type and pH on Adsorption, Mobility, and Efficacy of Imazaquin and Imazethapyr

Weed Science ◽

10.1017/s0043174500056137 ◽

1990 ◽

Vol 38 (1) ◽

pp. 67-73 ◽

Cited By ~ 119

Author(s):

R. N. Stougaard ◽

P. J. Shea ◽

A. R. Martin

Keyword(s):

Functional Groups ◽

Soil Type ◽

Sandy Loam ◽

Sandy Loam Soil ◽

Silty Clay ◽

Silt Loam ◽

Clay Loam ◽

Silty Clay Loam ◽

Steric Factors ◽

Loam Soil

Laboratory and greenhouse studies were conducted to determine imazaquin and imazethapyr adsorption, mobility, and efficacy in Sharpsburg silty clay loam, Holdrege silt loam, and Tripp sandy loam soils after adjusting pH to 5, 6, and 7. Both herbicides were more strongly absorbed, less mobile, and less efficacious at a lower pH. Observations were attributed to ionic bonding resulting from protonation of basic functional groups on the herbicide molecules as pH decreased. Adsorption was greatest in the silty clay loam and least in the sandy loam soil. Conversely, the herbicides were more efficacious and mobile in the more coarse-textured soils. Imazethapyr was less mobile, more highly adsorbed, and more phytotoxic than imazaquin. Greater adsorption of imazethapyr was attributed to a stronger basic pKaand steric factors.

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