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Root and Shoot Contribution to Carbon and Nitrogen Inputs in the Topsoil Layer in No-Tillage Crop Systems under Subtropical Conditions Rev. Bras. Ciênc. Solo
Redin,Marciel; Recous,Sylvie; Aita,Celso; Chaves,Bruno; Pfeifer,Ismael Cristiano; Bastos,Leonardo Mendes; Pilecco,Getúlio Elias; Giacomini,Sandro José.
ABSTRACT Recycling of carbon (C) and nitrogen (N) from plants into soils is decisive for maintaining soil organic matter and soil fertility. Therefore, we quantified plant biomass and C and N in the shoots and roots from the topsoil layer for a wide range of annual crops grown under subtropical conditions. We grew 26 species, 13 main crops, and 13 cover crops, in the field in standard sowing arrangements. Root biomass was recovered from the 0.00-0.20 m soil layer at flowering, and shoot biomass was measured at flowering for all crops and at maturity only for the main crops. Root dry matter (DM) exhibited an average of 14.9 ± 5.7 % of the total shoot biomass at flowering, and the mean shoot DM to root DM ratio was 6.9 (2.8-15.0) for the 26 crops considered....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass allocation; Cover crops; Fabaceae; Poaceae; Shoot to root ratio.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100528
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Summer Cover Crops Shoot Decomposition and Nitrogen Release in a No-Tilled Sandy Soil Rev. Bras. Ciênc. Solo
Weiler,Douglas Adams; Giacomini,Sandro José; Aita,Celso; Schmatz,Raquel; Pilecco,Getúlio Elias; Chaves,Bruno; Bastos,Leonardo Mendes.
ABSTRACT Cover crops have numerous benefits when used in a no-till system. Understanding the processes of decomposition and N release of summer cover crops (SCC) may help select species and management to be used in cropping systems. This study aimed to evaluate C and N loss of SCC shoots. Six SCCs were evaluated: velvet bean (Mucuna aterrima), pearl millet (Pennisetum americanum), dwarf pigeon pea (Cajanus cajan), sunn hemp (Crotalaria juncea), showy rattlebox (Crotalaria spectabilis), and jack bean (Canavalia ensiformis). The experiment was conducted for two years under no-till in soil classified as Typic Hapludalf (Argissolo). The C and N remaining of crop shoots were evaluated for 140 days using litter bags and the results were fitted with a simple...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chemical composition; Legumes; Cropping system; Crop residue; Nutrient cycling.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100414
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