Journal of Food, Agriculture and Environment

Grain yield and weed-mediated pest incidence in paddy rice crops under controllable irrigation regimes

Author(s):

Zhanyu Zhang ^{1, 2*}, Bougourou Soulemane ^{1, 2}, Xiangping Guo ^{1, 2}, Chengli Zhu ^{1, 2}, Hui-lian Xu ³

Recieved Date: 2011-12-10, Accepted Date: 2012-04-24

Abstract:

Weeds and pests significantly affect grain yield of rice crops. This study aimed at the determination of the possible control mechanisms for weeds and pests in paddy rice crops. A randomized complete block design with three replications was used in an experiment on the K818 rice variety. Four treatments were designed as (1) CK continuous flooding irrigation, (2) LL lower water-catching controlled irrigation, (3) LM moderate water-catching controlled irrigation and (4) HH higher water-catching controlled irrigation. The results showed that the treatments of LL and HH with the model of RCCI (water-catching and controlled irrigation) significantly (P<0.05) reduced the infestation of spontaneous plant Echinochloa pyramidalis from 4 plants m^-2 to 1 plant m^-2. The K818 rice variety showed an allelopathic effect against Echinochloa pyramidalis and the intermediate host plant of the rice stem borer Scirpophaga incertulas. This insect migrated from Echinochloa pyramidalis onto the rice. The LL treatment showed a lower infection rate of 1.43% due to the presence of Scirpophaga incertulas. The economic loss in LL treatment was 0.13 ton ha^-1. The LM treatment showed the highest infection rate of 2.05% and a significant economic loss of 0.19 ton ha^-1 (P<0.05). As one practice of integrated pest management, the LL treatment was considered the best option. A relationship between increased production of rice and weed management was established in our research.

Keywords:

Controllable irrigation, rice (Oryza sativa),  stem borer (Scirpophaga incertulas), weed (Echinochloa pyramidalis), yield

---

Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Agriculture
Pages: 626-631

---

Full text for Subscribers

---

Information:

Note to users

The requested document is freely available only to subscribers/registered users with an online subscription to the Journal of Food, Agriculture & Environment. If you have set up a personal subscription to this title please enter your user name and password. All abstracts are available for free.

Article purchasing

If you like to purchase this specific document such as article, review or this journal issue, contact us. Specify the title of the article or review, issue, number, volume and date of the publication. Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.

---

Purchase this Article:   20 Purchase PDF Order Reprints for 15

---

Share this article :