Abstract
The development of plant roots is known to play a very important role in the uptake of water and nutrients by rice plants. However, there are few studies on what changes, if any, are induced in the rooting systems of rice plants under System of Rice Intensification (SRI) management. This research evaluated changes of rice roots with SRI method compared to conventional method of irrigated rice cultivation and assessed influences that could improve rice yield. Under SRI management, plant roots were significantly longer and heavier than with conventional method. SRI method also increased the number of root hairs by 60%, and root hairs were healthier and more vigorous compared with conventional method. However, root respiration was not different in the two methods. There was less formation of aerenchyma (air pockets) in rice roots with SRI method, as both the number and size of root aerenchyma were lower with SRI than with conventional method. The SRI method was able to improve the root length, root dry weight compared to the conventional method. The SRI method was also able to increase the number of root hairs by 60% compared with the conventional method. Eh measurements in the soil with SRI method were higher than with conventional method. However, there was no significant different in root respiration. The aerenchyma formation of rice roots in SRI method was lower than conventional method.
Highlights
The System of Rice Intensification (SRI) is a method of rice cultivation that aims to improve the growth and development of rice plants through changes in crop and water management rather than by depending on new varieties and external inputs
SRI method increased the number of root hairs by 60%, and root hairs were healthier and more vigorous compared with conventional method
The SRI method was able to increase the number of root hairs by 60% compared with the conventional method
Summary
The System of Rice Intensification (SRI) is a method of rice cultivation that aims to improve the growth and development of rice plants through changes in crop and water management rather than by depending on new varieties and external inputs. Significant increases in rice yield when cultivating with SRI method under a wide range of ecological/climatic conditions have been reported by many researchers. The SRI method has been adopted by various countries, over 50, and the research on the SRI method continues to focus on how to manage plants, soil, water and nutrients better to promote the growth and functioning of their root systems so that rice plants have an optimum growing environment (Uphoff 2005). Good root growth and functioning will make additional water and minerals available to the plant (Kozlowski 1997)
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