15N-labeled nitrogen from green manure and ammonium sulfate utilization by the sugarcane ratoon

Abstract

Legumes as green manure are alternative sources of nitrogen (N) for crops and can supplement or even replace mineral nitrogen fertilization due to their potential for biological nitrogen fixation (BNF). The utilization of nitrogen by sugarcane (Saccharum spp.) fertilized with sunn hemp (Crotalaria juncea L.) and ammonium sulfate (AS) was evaluated using the 15N recovery was evaluated in the two first harvests. In the sum of the three harvests, the highest stalk yields were obtained with a combination of green manure and inorganic N fertilizer; however, in the second cutting the yields were higher where SH was used than in plots with AS. N foi avaliada nas duas primeiras colheitas. Na soma das três safras, os maiores rendimentos de colmos foram obtidos com uma combinação de adubos verdes e fertilizantes N inorgânicos, mas, no segundo corte rendimentos superiores foram observados nos tratamentos com CJ em comparação com os observados com SA. A recuperação de N nas primeiras duas safras consecutivas representou 19 a 21% do N aplicado como adubo verde e 46 a 49% do N aplicado como SA. As quantidades de N inorgânico derivado das fontes marcadas, presentes na camada 0-0,4 m do solo na primeira safra após a aplicação do N foram inferiores a 1 kg ha -1 .

Nitrogen fertilization of coffee: organic compost and Crotalaria juncea L.

“…This complementation with C. juncea was reported for corn (Silva et al, 2006) and sugarcane (Ambrosano et al, 2011) and wit early or late legume species in grapevine (Ovalle et al, 2010).…”

“…Similarly, Ambrosano et al (2011) obtained 4.1% of N-Cj in sugarcane leaves in the 2 nd harvest after C. juncea application, indicating the persistence of residual N in the soil. Fenilli et al, (2008) found in the litter and in the soil 46.3% of applied N after a year of application of marked ammonium sulfate in a coffee plantation.…”

“…Ovalle et al (2010) applied 68-194 kg N ha -1 with early and late legumes, respectively, supplementary to 40 kg ha -1 mineral N and found in grapevine leaves, 14 to 20% of NfGM. Ambrosano et al (2011) obtained 10.9% of N derived from C. juncea in sugarcane leaves fertilized with 196 kg N-Cj ha -1 . The value found from the first application (6.85%) is below the values found in the literature, but 17.93% from the second application is close to the results reported.…”

Ratoon sugarcane yield integrated drip-irrigation and nitrogen fertilization

“…The previous value of HSP was 31.13Mg ha -1 and differs substantially from that found in this study (64.7Mg ha -1 ) for not irrigate sugarcane with 0kg ha -1 of N. One possible explanation may be the residual effect of nitrogen fertilization in previous seasons (the entire area was fertilized with a rate of 70kg ha -1 of N during the previous crop). AMBROSANO et al (2011) The difference between T1 and T5 managements regarding HSP can be explained by the greater efficiency of the irrigation system (subsurface dripping) compared to not irrigate sugarcane, even with no rainfall amounts sufficient to cause severe deficits for the period studied (Figure 1). …”

Crop Rotation Biomass and Effects on Sugarcane Yield in Brazil

“…Residue incorporation studies of legumes using 15 N label indicate that 10 to 34% of the legume N can be recovered in the subsequent rye or wheat crop, 42% in rice, 24% recovery from Velvet bean by corn crop, around 15% of N recovery from sunn hemp by corn plants in no-till system, 30% by maize [51],and 5% of N recovery from sunn hemp by sugarcane [12], and ranged from 19 to 21% when the recovery was observed from sunn hemp by two sugarcane harvest [17].…”