Resumo

TORRES NAVA, Daniel; SANDOVAL CASTRO, Engelberto; PENA-CABRIALES, Juan José  e  VERA-NUNEZ, José Antonio. Contribution of nitrogen from chicken manure to broccoli crop (Brassica oleracea L.). Rev. Fac. Cienc. Agrar., Univ. Nac. Cuyo [online]. 2017, vol.49, n.2, pp.105-116. ISSN 1853-8665.

The nitrogen (N) contribution from chicken manure to broccoli crop (Brassica oleracea L.) was evaluate using the ¹⁵N isotopic technique. Six treatments combining chemical fertilizer (N-phosphonitrate) and organic fertilizer (N-chicken manure) at a total rate of 300 kg N ha^-1 were established: 1) 0 + 300; 2) 100 + 200; 3) 150 + 150; 4) 200 + 100; 5) 300 kg N-phosphonitrate ha^-1 + 0 kg N-chicken manure ha^-1; and 6) an unfertilized N control. Five replicates per treatment were established under a statistical design of random blocks. The highest yield of broccoli (heads) corresponded to treatments 200 kg N-phosphonitrate ha^-1 + 100 kg N-chicken manure ha^-1 and 300 kg N-phosphonitrate ha^-1 yielding 16 and 17 Mg ha^-1, respectively. The highest value of total N-uptake (347 kg N ha^-1) was observed in treatment corresponding to 150 kg N-phosphonitrate ha^-1 + 150 kg N-chicken manure ha^-1. The ¹⁵N data indicate low values of N-fertilizer uptake (3.2-4.1%) when manure was applied. The N-phosphonitrate alone treatment showed a higher value of N-fertilizer (28.7-48.0%) than treatment 200 kg N-phosphonitrate ha^-1 + 100 kg N-chicken manure ha^-1 (4.5-5.1%). The N uptake by plants from manure was 29.5% average. The combination of chemical and organic fertilizers resulted in a higher total N-uptake. The constant application of manure to soil under broccoli production in Puebla region resulted in a significant contribution of soil N to the broccoli crop.

Palavras-chave : ¹⁵N-uptake; Organic fertilizer; Synergetic.