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Mathematical Model for Rice Growth Cultivated with SRI Method
May 19, 2010
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Indonesian food supply depends highly on the rice. Although efforts of food diversification has already taken place, the rice demand has increased in accordance to population growth. On the other hand the availability of land and water resources to cultivate rice is decreasing. Therefore, it is required to increase rice production in more efficient way.

Recently, System of Rice Intensification (SRI) has spread as an innovation of rice cultivation. Basic principles of SRI are young seedlings, shallow and wide transplanting. Land was irrigated minimally to avoid inunndation. Organic fertilizer is encouraged.

Recently, System of Rice Intensification (SRI) has spread as an innovation of rice cultivation. Basic principles of SRI are young seedlings, shallow and wide transplanting. Land was irrigated minimally to avoid inunndation. Organic fertilizer is encouraged.

In Indonesia, empirically SRI shows satisfactory results by achieving rice production of 6 to 11 ton/ha. In some other areas, SRI failed and produced very low rice. The SRI metod still needs some researches and developments due to unknown phenomena in SRI implementation and its application in various environment.

Topics on SRI have been studied in the first and second planting seasons i.e. November 2009 to March 2010 and March to July 2010, respectively. The research has been conducted in a farmland of Ngestiharjo Village, Wates, Kulonprogo. The research is supported by Serayu-Opak Catchment Authority.

One of the topics is development of mathematical model for rice growth cultivated with SRI method. The models would be verified for crop height and rice tillers in the first planting season. Root growth model would be verified in the second planting season. In addition, it would also studied the influence of fertilizer composition on production which consists of productive tiller number, tassel length, number of grains each tassel, and productivity.

SRI method encourages the use of organic fertilizer. Therefore it is also studied the impact of organic fertilizer on soil water holding capacity. In the second planting season, it would be studied the impact of organic fertilizer on rice quality especially its nutrition content and rice stalk strength to withstand from wind force.

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