Sorghum yield after liming and combinations of phosphorus sources

Revista Brasileira de Engenharia Agricola e Ambiental

Resende, Álvaro V.¹  Portugal, Arley F.¹  Silveira, Thiago C.²  Kondo, Marcos K.²  Pegoraro, Rodinei F.³ 

[1] Embrapa Milho e Sorgo, Sete Lagoas, Brazil;Universidade Estadual de Montes Claros, Janaúba, Brazil;Universidade Federal de Minas Gerais, Montes Claros, Brazil

关键词: residual fertilization;    phosphorus content;    agronomic efficiency index.;   

DOI  :  10.1590/1807-1929/agriambi.v22n4p243-248

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

Phosphate fertilization has increased sorghum yield, but few studies are available on sorghum production and efficient fertilizer management related to liming and phosphorus (P) sources. This work evaluates production, dry matter partitioning and agronomic efficiency (AEI) in successive sorghum cycles after application of limestone and combinations of phosphorus sources. Two cycles were conducted in sequence in the same experimental field, in a 2 x 6 factorial scheme, corresponding to soil with or without liming and six combinations of P2O5 sources: control (0 kg ha-1 P2O5), 100% Itafós natural phosphate (NP), 75% NP + 25% single superphosphate (SS), 50% NP + 50% SS, 25% NP + 75% SS and 100% SS. Pots with capacity for 8 dm3 were used in a randomized block design with four replicates. The first cycle, conducted in the summer/autumn season, reached the highest dry matter production and P accumulation in treatments with higher SS proportions, leading to higher AEI. Subsequently, in the second cycle, conducted considering only the residual phosphate fertilization of the first cycle, highest dry matter production and AEI were obtained in the treatment with 100% or higher proportions of natural phosphate in the presence of liming, most likely due to the gradual release of P.

【 授权许可】

CC BY