ABSTRACT Currently, most nitrogen fertilizer is side-dressed when corn is in the four (V4) to eight (V8) expanded leaf stage. However, recent studies have shown that modern hybrids take up high amounts of nitrogen during grain filling. This indicates that a late nitrogen fertilization, at the time of crop flowering, may be important to optimize corn agronomic performance. This study aimed to evaluate the effect of the timing and splitting of nitrogen side-dress application on the agronomic performance of early […]

Sugarcane is considered a Si-accumulating plant, but in Brazil, where several soil types are used for cultivation, there is little information about silicon (Si) fertilization. The objectives of this study were to evaluate the silicon availability, uptake and recovery index of Si from the applied silicate on tropical soils with and without silicate fertilization, in three crops. The experiments in pots (100 L) were performed with specific Si rates (0, 185, 370 and 555 kg ha-1 Si), three soils (Quartzipsamment-Q, […]

Gypsum is an amendment used to alleviate subsoil acidity. However, there are doubts about its use for acid soils that previously received applications of lime and fertilizers. There are also doubts on the use of gypsum in the cases of the use of high liming rates or for aluminum tolerant crop varieties. This paper describes a limestone and gypsum experiment conducted from 1987 to 1992 at the Tatui Experimental Station, State of São Paulo, Brazil. The experiment was on a […]