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 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

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.

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