Abstract
Herbicide formulations can alter the herbicide performance, affecting the application safety and weed control efficiency. Thus, the objective of this work was to compare the dynamics of clomazone herbicide applied single and combined with sulfentrazone on sugarcane (Saccharum spp.) straw. Laminated polypropylene containers filled with sugarcane straw (10 t ha−1) were subjected to two clomazone formulations (microencapsulated and conventional formulations; 1200 g ha−1) applied single or combined with sulfentrazone (600 g ha−1) with four replications, and the experiment was duplicated. The application was performed indoors with an automated sprayer. After application, accumulated rainfall depths (0, 5, 10, 20, 50, and 100 mm) on the treated containers were simulated soon after the herbicide applications, and the percolated waters were subsequently collected for herbicide quantification by chromatography and mass spectrometry (LC-MS/MS). The microencapsulated formulation of clomazone applied single or combined with sulfentrazone enabled the recovery of higher quantity of clomazone (>80%), with the advantage that a large percentage remained encapsulated (>70%), thus decreasing losses and increasing the product efficiency. The 30 mm simulated rainfall efficiently carried the clomazone herbicide when its microencapsulated formulation was applied, whereas its conventional formulation required higher rainfall depths (60 mm). Sulfentrazone was easily carried through the sugarcane straw by the rainfall depths when it was combined with clomazone, regardless of the clomazone formulation. The clomazone formulation affect the percolation dynamics of this herbicide through the sugarcane straw.
Highlights
The sugarcane crop is a feedstock to produce sugar, bioethanol and electricity; and is one of the main tropical agricultural crops [1]
The treatments consisted of two clomazone formulations applied single or combined with sulfentrazone
The total clomazone recovered after the application of the microencapsulated formulation in absence of sulfentrazone was 80% of the total applied; approximately 12% of the clomazone was free in the solution, and most of it (87%) remained microencapsulated, even after 100 mm of simulated rainfall depth (Figure 3A). These results demonstrate that the release of clomazone form the suspension concentred (SC) formulation is slow
Summary
The sugarcane crop is a feedstock to produce sugar, bioethanol and electricity; and is one of the main tropical agricultural crops [1]. In Brazil, the Raw Cane Production System is predominant In this system, the harvest is carried out mechanically without burning and can maintain a thick layer of plant residues on the soil surface, generally greater than 12 ton of straw ha−1 [6]; the use of this system has affected and changed the occurrence of weed species and, their management [6]. The straw layer affects weed germination and emergence and is a barrier that prevents herbicides to reach the soil immediately after application [5,7] Factors such as the amount and distribution of straw in the soil contribute to a wide range of weed management scenarios [6]. The management of weeds in sugarcane is extremely complex and requires attention and knowledge for a satisfactory execution
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
