Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (20): 4284-4292.doi: 10.3864/j.issn.0578-1752.2013.20.011

• PLANT PROTECTION • Previous Articles     Next Articles

Influence of Sprayer and Application Rate on Pesticide Deposit Character on Rice Canopy

 XU  De-Jin, GU  Zhong-Yan, XU  Guang-Chun, XU  Xiao-Long   

  1. Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014
  • Received:2013-04-07 Online:2013-10-15 Published:2013-07-01

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Abstract: 【Objective】The objective of this study is to illustrate the relationship between pesticide deposit structure and spatial distribution on control efficiency, and to study the effects of sprayer and application rate on pesticide deposit character on rice canopy. 【Method】Droplets coverage and density of pesticide were assayed with DepositScan software after pesticide collected with the relevant collection device and water-sensitive paper. Meanwhile, the tracer material was also used to estimate the amounts of pesticide deposition.【Result】Sprayed by the motorized knapsack mist blower (MKM) and the lever-operated knapsack sprayer (LKS) at different application rates, the droplet coverage rate of pesticide at adaxial side of rice leaf was significantly higher than that at abaxial side with a leaf angle of 45° and 0°. The droplet densities at the abaxial side of the leaf with a leaf angle of 0° were more than 200 droplets/cm2 with pesticide sprayed by the MKM at the application rates of 225, 450 and 600 L•hm-2. Moreover, significant differences were found among these application rates. The droplet densities at the abaxial side of the leaf with the leaf angles of 0 ° and 45° were all below 15 droplets/cm2 with pesticides sprayed by LKS at the application rates of 600, 900 and 1 200 L•hm-2. In addition, no significant differences were found among these application rates. Application with the same dosage, the pesticide deposit amount in rice canopy at different sites reached the summit with pesticides sprayed by LKS at the application rate of 450 L•hm-2. However, a significant difference was not observed among the pesticide deposit amounts with pesticides sprayed by LKS at different application rates. Compared with MKM, pesticide deposit amounts at the leaf abaxial side were lower with pesticides sprayed by LKS. Application of chlorantraniliprole at 15 g active ingredients per hm2, the best control efficiency was observed at the application rate of 450 L•hm-2 sprayed by MKM, however, the worst control efficiency was showed at the application rate of 1 200 L•hm-2 sprayed by LKS.【Conclusion】 Application with both MKM and LKS in rice field, the pesticide droplets coverage rates at leaf adaxial side were all higher than leaf abaxial side. Sprayed by MKM, improvements of the droplets density and coverage rate were observed at the leaf abaxial side with the increase of the pesticide application amounts. However, sprayed by LKS, significant effects were not found in this study. Compared with LKS, solution sprayed by MKM can increase the droplet density, coverage rate and the pesticide deposit amount significantly, thus enhancing the control effect.

Key words: rice , sprayer , application rate of spray liquid , droplet density , droplet coverage ratio , deposition

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