Nitrogen mineralization in sandy loam soils under an intensive double-cropping forage system with dairy-cattle slurry applications

Nitrogen dynamics in volcanic soils under permanent pasture

“…For this particular situation (soil bulk density = 0.745, rooting depth = 40 cm) a contribution of 160.6 kg ha −1 of mineral N was estimated for a period of 55 days. Similar results were found by Trindade et al (2001) and Iyyemperumal et al (2007), for related conditions. Since this considerable mineral N amount is released in the soil during time, being gradually available to the grass, the fertilizer inputs (60 kg N ha −1 ) could be reduced or even eliminated.…”

“…However, a regression analysis showed that the variation in N mineralization between periods was poorly explained by these two variables, probably due to the multiple interactions between all the variables influencing the process. The same was found by Trindade et al (2001). Table 4 shows the application of the mass balance approach (Eq.…”

Nitrogen dynamics in volcanic soils under permanent pasture

“…For this particular situation (soil bulk density = 0.745, rooting depth = 40 cm) a contribution of 160.6 kg ha −1 of mineral N was estimated for a period of 55 days. Similar results were found by Trindade et al (2001) and Iyyemperumal et al (2007), for related conditions. Since this considerable mineral N amount is released in the soil during time, being gradually available to the grass, the fertilizer inputs (60 kg N ha −1 ) could be reduced or even eliminated.…”

“…However, a regression analysis showed that the variation in N mineralization between periods was poorly explained by these two variables, probably due to the multiple interactions between all the variables influencing the process. The same was found by Trindade et al (2001). Table 4 shows the application of the mass balance approach (Eq.…”

Assessment of the potential N mineralization of different particle‐size fractions in two dairy cattle slurries

“…The N mineralized or immobilized was expressed as a percentage of the total N applied via the slurry fractions. These values of potential mineralization were lower than those reported in previous studies (Chadwick et al, 2000, Kyvsgaard et al, 2000Trehan, 2000;Trindade et al, 2001) where N mineralization from different types of whole slurry was determined during longer time periods. Interestingly, there was greater N mineralization from the MS slurry fractions than from the GS slurry even though the C-to-N ratios of the different fractions were consistently higher in the MS slurry than in the GS slurry, what is in contradiction with previous findings (Chadwick et al, 2000).…”

Effects of different rates and timing of application of nitrogen as slurry and mineral fertilizer on yield of herbage and nitrate‐leaching potential of a maize/Italian ryegrass cropping system in north‐west Portugal

“…, 1994), the higher efficiency values found here could be explained by the cumulative after‐effects of repeated slurry applications associated with previous management. In intensive dairy farming with arable forage crops in mild temperate climates, as in the present study, it may be expected that the frequent and systematic additions of slurry to the soil will lead to the maintenance of high and constant mineralization rates (Trindade et al. , 2001; Schröder et al.…”

“…The high efficiency of use of slurry‐N in this study may be related to the dynamics of the mineralization process under this intensive forage system. Trindade et al. (2001) reported that the lowest net rates of N mineralization usually occurred immediately after the application of slurry and/or at the end of the growing season for maize when mineral N released may be more vulnerable to loss by leaching.…”

Nitrogen dynamics in volcanic soils under permanent pasture

“…For this particular situation (soil bulk density = 0.745, rooting depth = 40 cm) a contribution of 160.6 kg ha −1 of mineral N was estimated for a period of 55 days. Similar results were found by Trindade et al (2001) and Iyyemperumal et al (2007), for related conditions. Since this considerable mineral N amount is released in the soil during time, being gradually available to the grass, the fertilizer inputs (60 kg N ha −1 ) could be reduced or even eliminated.…”

“…However, a regression analysis showed that the variation in N mineralization between periods was poorly explained by these two variables, probably due to the multiple interactions between all the variables influencing the process. The same was found by Trindade et al (2001). Table 4 shows the application of the mass balance approach (Eq.…”

Assessment of the potential N mineralization of different particle‐size fractions in two dairy cattle slurries

“…The N mineralized or immobilized was expressed as a percentage of the total N applied via the slurry fractions. These values of potential mineralization were lower than those reported in previous studies (Chadwick et al, 2000, Kyvsgaard et al, 2000Trehan, 2000;Trindade et al, 2001) where N mineralization from different types of whole slurry was determined during longer time periods. Interestingly, there was greater N mineralization from the MS slurry fractions than from the GS slurry even though the C-to-N ratios of the different fractions were consistently higher in the MS slurry than in the GS slurry, what is in contradiction with previous findings (Chadwick et al, 2000).…”

Effects of different rates and timing of application of nitrogen as slurry and mineral fertilizer on yield of herbage and nitrate‐leaching potential of a maize/Italian ryegrass cropping system in north‐west Portugal

“…, 1994), the higher efficiency values found here could be explained by the cumulative after‐effects of repeated slurry applications associated with previous management. In intensive dairy farming with arable forage crops in mild temperate climates, as in the present study, it may be expected that the frequent and systematic additions of slurry to the soil will lead to the maintenance of high and constant mineralization rates (Trindade et al. , 2001; Schröder et al.…”

“…The high efficiency of use of slurry‐N in this study may be related to the dynamics of the mineralization process under this intensive forage system. Trindade et al. (2001) reported that the lowest net rates of N mineralization usually occurred immediately after the application of slurry and/or at the end of the growing season for maize when mineral N released may be more vulnerable to loss by leaching.…”

Nitrogen dynamics in volcanic soils under permanent pasture

“…For this particular situation (soil bulk density = 0.745, rooting depth = 40 cm) a contribution of 160.6 kg ha −1 of mineral N was estimated for a period of 55 days. Similar results were found by Trindade et al (2001) and Iyyemperumal et al (2007), for related conditions. Since this considerable mineral N amount is released in the soil during time, being gradually available to the grass, the fertilizer inputs (60 kg N ha −1 ) could be reduced or even eliminated.…”

“…However, a regression analysis showed that the variation in N mineralization between periods was poorly explained by these two variables, probably due to the multiple interactions between all the variables influencing the process. The same was found by Trindade et al (2001). Table 4 shows the application of the mass balance approach (Eq.…”

Assessment of the potential N mineralization of different particle‐size fractions in two dairy cattle slurries

“…The N mineralized or immobilized was expressed as a percentage of the total N applied via the slurry fractions. These values of potential mineralization were lower than those reported in previous studies (Chadwick et al, 2000, Kyvsgaard et al, 2000Trehan, 2000;Trindade et al, 2001) where N mineralization from different types of whole slurry was determined during longer time periods. Interestingly, there was greater N mineralization from the MS slurry fractions than from the GS slurry even though the C-to-N ratios of the different fractions were consistently higher in the MS slurry than in the GS slurry, what is in contradiction with previous findings (Chadwick et al, 2000).…”

Effects of different rates and timing of application of nitrogen as slurry and mineral fertilizer on yield of herbage and nitrate‐leaching potential of a maize/Italian ryegrass cropping system in north‐west Portugal

“…, 1994), the higher efficiency values found here could be explained by the cumulative after‐effects of repeated slurry applications associated with previous management. In intensive dairy farming with arable forage crops in mild temperate climates, as in the present study, it may be expected that the frequent and systematic additions of slurry to the soil will lead to the maintenance of high and constant mineralization rates (Trindade et al. , 2001; Schröder et al.…”

“…The high efficiency of use of slurry‐N in this study may be related to the dynamics of the mineralization process under this intensive forage system. Trindade et al. (2001) reported that the lowest net rates of N mineralization usually occurred immediately after the application of slurry and/or at the end of the growing season for maize when mineral N released may be more vulnerable to loss by leaching.…”