Mulching with Sugarcane Straw Reduces Weed Density in Sugarcane Field

作者：Hoshino Adriano Thibes; Hata Fernando Teruhiko^*; de Aquino Gisele Silva; Menezes Junior Ayres de Oliveira; Ventura Mauricio Ursi; Medina Cristiane de Conti

来源：International Journal of Agriculture and Biology, 2017, 19(1): 121-124.

DOI：10.17957/1JAB/15.0252

• Spontaneous plants
• Saccharum officinarum
• No-burn sugarcane
• Weed control

Occurrence of weeds in sugarcane crop according to levels of straw over the soil was studied. Experiment was carried out during two annual cycles. Treatments were 0 % (no straw); 25, 50, 75 and 100% (i.e., 5, 10, 15 and 20 t/ha of straw, respectively); and straw burned over the soil. Floristic analysis of weed species was achieved. Percent area occupied by weeds was assessed visually and regression analysis between weeds and amount of straw mulch was performed. Floristic analysis characterized 19 weed species, from eight botanical families. Amaranthaceae, Asteraceae, Commelinaceae, Convolvulaceae, Euphothiaceae, Poaceae, Portulacaceae and Solanaceae. Highest richness of species was observed for Asteraceae and Poaceae, with seven and four species, respectively. Higher frequency was found for Amaranthus hybridus, A. viridis and Physalis angulata (85% of samples) for first annual crop cycle; and A. hybridus, Bidens pilosa and Cenchrus echinatus predominated (83% of samples) in second cycle. A. hybridus was the most frequent species in both cycles. The highest density of weeds was observed in treatments with straw burned. Application of 75 and 100% straw showed highest suppression for low and high density of weeds, respectively. Increasing level of straw leads correspondent weed control. That information is vital to orientate decision which amount will deposit over the soil since in recent years the straw is also demanded for alternative sources of energy, as thermal or second generation bio-ethanol.

• 出版日期2017