scholarly journals The Crucial Role of Soil Organic Matter in Satisfying the Phosphorus Requirements of Olive Trees (Olea europaea L.)

Agriculture ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 111
Author(s):  
Niki Christopoulou ◽  
Theocharis Chatzistathis ◽  
Efimia M. Papatheodorou ◽  
Vassilis Aschonitis ◽  
Nikolaos Monokrousos
Keyword(s):  
Organic Matter ◽  
Organic Matter Content ◽  
Matter Content ◽  
Nutrient Concentrations ◽  
Soil P ◽  
High Organic Matter ◽  
Foliar Nutrient ◽  
Foliar Nutrient Concentrations ◽  
Olive Trees ◽  
Extractable Soil

Under high organic matter content, even under low extractable soil P concentrations, sufficient or over-sufficient foliar P levels may be found. This multi-year study aimed at examining the effects of organic matter content and irrigation management on (a) soil fertility, (b) P-cycle related soil enzymes (acid and alkaline phosphatase, pyrophosphatase) and (c) foliar nutrient concentrations. Irrigated and non-irrigated groves of fully productive trees of the cultivar “Chondrolia Chalkidikis” with low organic matter (LOM < 1.5%), medium organic matter (1.5% < MOM < 2.5%) and high organic matter (HOM > 2.5%) were selected for the experimentation. It was hypothesized that olive groves receiving high inorganic fertilization and irrigation inputs (usually with medium to relatively low organic matter content) would show higher soil and foliar P concentrations compared to the non-irrigated groves with higher organic matter content receiving manure applications. Most of the soil variables (including the three enzymes’ activities) were affected by differences in organic matter content. However, organic matter content did not show a significant influence on foliar nutrient concentrations. Olive trees, especially those cultivated in soils with high organic matter content (receiving organic fertilization), can over-satisfy their P nutritional needs, even though soil analyses show low soil extractable P concentrations, probably due to the high enzymatic activity of acid and alkaline phosphatases. The practical conclusion of this study is that P fertilizer recommendations should be primarily based on foliar P rather than on extractable soil P.

scholarly journals Comparison of Total Nitrogen Methods Applied for Histosols and Soil Horizons with High Organic Matter Content

2006 ◽  
Vol 37 (7-8) ◽  
pp. 939-943 ◽  
Author(s):  
Marcos Gervasio Pereira ◽  
Ademar Espindula ◽  
Gustavo Souza Valladares ◽  
Lúcia Helena Cunha dos Anjos ◽  
Vinícius de Melo Benites ◽  
...  
Keyword(s):  
Organic Matter ◽  
Total Nitrogen ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Horizons ◽  
High Organic Matter Content ◽  
High Organic Matter

Organic phosphorus speciation in Australian Red Chromosols: stoichiometric control

Soil Research ◽  
2016 ◽  
Vol 54 (1) ◽  
pp. 11 ◽  
Author(s):  
Melinda R. S. Moata ◽  
Ashlea L. Doolette ◽  
Ronald J. Smernik ◽  
Ann M. McNeill ◽  
Lynne M. Macdonald
Keyword(s):  
Organic Matter ◽  
Soil Type ◽  
Organic Phosphorus ◽  
Organic Matter Content ◽  
Matter Content ◽  
31P Nmr Spectroscopy ◽  
Chemical Forms ◽  
Organic P ◽  
Soil C ◽  
Soil P

Organic phosphorus (P) plays an important role in the soil P cycle. It is present in various chemical forms, the relative amounts of which vary among soils, due to factors including climate, land use, and soil type. Few studies have investigated co-variation between P types or stoichiometric correlation with the key elemental components of organic matter– carbon (C) and nitrogen (N), both of which may influence P pool structure and dynamics in agricultural soils. In this study we determined the organic P speciation of twenty Australian Red Chromosols soils, a soil type widely used for cropping in Australia. Eight different chemical forms of P were quantified by 31P NMR spectroscopy, with a large majority (>90%) in all soils identified as orthophosphate and humic P. The strongest correlations (r2 = 0.77–0.85, P < 0.001) between P types were found among minor components: (i) between two inositol hexakisphosphate isomers (myo and scyllo) and (ii) between phospholipids and RNA (both detected as their alkaline hydrolysis products). Total soil C and N were correlated with phospholipid and RNA P, but not the most abundant P forms of orthophosphate and humic P. This suggests an influence of organic matter content on the organic P pool consisting of phospholipid and RNA, but not on inositol P or the largest organic P pool in these soils – humic P.

Determination of glyphosate in surface water with high organic matter content

2017 ◽  
Vol 24 (9) ◽  
pp. 7880-7888 ◽  
Author(s):  
Vahur Toss ◽  
Ivo Leito ◽  
Sergei Yurchenko ◽  
Rene Freiberg ◽  
Anneli Kruve
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Organic Matter Content ◽  
Matter Content ◽  
High Organic Matter Content ◽  
High Organic Matter

scholarly journals Bulk Density Prediction for Histosols and Soil Horizons with High Organic Matter Content

2017 ◽  
Vol 41 (0) ◽  
Author(s):  
Sidinei Julio Beutler ◽  
Marcos Gervasio Pereira ◽  
Wagner de Souza Tassinari ◽  
Michele Duarte de Menezes ◽  
Gustavo Souza Valladares ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bulk Density ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Horizons ◽  
High Organic Matter Content ◽  
Density Prediction ◽  
High Organic Matter

scholarly journals Maize response to nitrogen fertilization timing in two tillage systems in a soil with high organic matter content

2007 ◽  
Vol 31 (3) ◽  
pp. 507-517 ◽  
Author(s):  
Luis Sangoi ◽  
Paulo Roberto Ernani ◽  
Paulo Regis Ferreira da Silva
Keyword(s):  
Organic Matter ◽  
Grain Yield ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Tillage ◽  
Tillage Systems ◽  
High Organic Matter Content ◽  
High Organic Matter ◽  
Tillage System ◽  
Maize Response

No-tillage systems, associated to black oat as preceding cover crop, have been increasingly adopted. This has motivated anticipated maize nitrogen fertilization, transferring it from the side-dress system at the stage when plants have five to six expanded leaves to when the preceding cover crop is eliminated or to maize sowing. This study was conducted to evaluate the effects of soil tillage system and timing of N fertilization on maize grain yield and agronomic efficiency of N applied to a soil with high organic matter content. A three-year field experiment was conducted in Lages, state of Santa Catarina, from 1999 onwards. Treatments were set up in a split plot arrangement. Two soil tillage systems were tested in the main plots: conventional tillage (CT) and no-tillage (NT). Six N management systems were assessed in the split-plots: S1 - control, without N application; S2 - all N (100 kg ha-1) applied at oat desiccation; S3 - all N applied at maize sowing; S4 - all N side-dressed when maize had five expanded leaves (V5 growth stage); S5 - 1/3 of N rate applied at maize sowing and 2/3 at V5; S6 - 2/3 of nitrogen rate applied at maize sowing and 1/3 at V5. Maize response to the time and form of splitting N was not affected by the soil tillage system. Grain yield ranged from 6.0 to 11.8 t ha-1. The anticipation of N application (S2 and S3) decreased grain yield in two of three years. In the rainiest early spring season (2000/2001) of the experiment, S4 promoted an yield advantage of 2.2 t ha-1 over S2 and S3. Application of total N rate before or at sowing decreased the number of kernels produced per ear in 2000/2001 and 2001/2002 and the number of ears produced per area in 2001/2002, resulting in reduced grain yield. The agronomic efficiency of applied N (kg grain increase/kg of N applied) ranged from 13.9 to 38.8 and was always higher in the S4 than in the S2 and S3 N systems. Short-term N immobilization did not reduce grain yield when no N was applied before or at maize sowing in a soil with high organic matter content, regardless of the soil tillage system.

scholarly journals THE EFFECT OF SOIL ORGANIC MATTER CONTENT ON THE Cs-137 CONCENTRATION IN CROPS

1967 ◽  
Vol 47 (1) ◽  
pp. 7-13 ◽  
Author(s):  
E. J. Evans ◽  
A. J. Dekker
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Organic Matter Content ◽  
High Organic Matter ◽  
Subsequent Crop ◽  
Mineral Soils ◽  
Different Levels

The Cs-137 concentration of oats grown in peat in the greenhouse was affected only slightly by liming. The values were considerably higher than those obtained when mineral soils were used. The effect of different levels of soil organic matter on Cs-137 concentration in oats and alfalfa was obscured by variable exchangeable soil-K contents. But high Cs-137 concentrations were associated with high organic-matter contents provided K was added to the soils. In contrast to the results obtained with oats, the Cs-137 concentration in lettuce grown after oats was found to decrease with increase in soil organic-matter content. It was concluded that the effect of organic matter on the Cs-137 concentration in the second or subsequent crop in a rotation might be different from its effect in the first crop.

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