Growth Analysis During Recovery Period of Rice Seedlings Due to Phosphorus Application Before Submergence

Irmawati Irmawati, Yernelis Syawal, Imam Wibisono

Abstract


Rainfed lowland has been widely used for rice cultivation by farmers across Asia despite its risk of flooding.
Flash flooding usually will occur several times during the rice growth period. The condition is even worse in
South Sumatra with the lack of drainage system that sometimes put rice plants in full submergence stress
condition. The recovery period after submergence is considered an important phase in determining plant
survival. Thus this study was conducted to evaluate rice seedlings' growth analysis during submergence and after
recovery period due to the application of phosphorus. Evaluating these traits was beneficial to study rice plant
morphological and physiological response to submergence stress. Two rice cultivars were cultivated: Ciherang
(Indonesian commercial cultivar) and a submergence tolerant cultivar, Inpari 31 (Ciherang sub-1). Phosphorus
application was given to plants before submergence as following P0 = no phosphorus (control); P1 = phosphorus
application three days before submergence; P2 = phosphorus application seven days before submergence; P3 =
phosphorus application fourteen days before submergence. Growth analysis parameters then were calculated
based on the data collected from during and post submergence condition. Results showed that during
submergence, relative growth rate (RGR) was positively correlated to the changes in net assimilation rate (NAR)
and negatively correlated to leaf area ratio (LAR). While after 14 days of the recovery period, RGR was more
influenced by the increase of LAR.


Keywords


leaf area ratio, net assimilation rate, growth rate, rice, submergence

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