Abstract
Plant growth interpretation in term of accumulated intercepted solar radiation and the radiation use efficiency (RUE) was used to study the growth and analysis of Jatropha (Jatropha curcas L.). A number of crop growth simulation models have been developed using the RUE concept to predict crop growth and yield in various environments. These models generally calculate daily biomass production as the product of the quantity of radiation intercepted and RUE. This research was carried out to quantify the RUE, biomass and leaf area index on Jatropha under rainfall condition, four levels of nitrogen fertilizer (N) and three population densities (P) planted twice. The experiments used a systematic Nelder fan design with 9 spokes and 4 – 5 rings were conducted at SEAMEO-BIOTROP field experiment in 2007. Data from the first experiment were used for parameterization and calibration and the second experiment data for model validation. Values of RUE were determined by nitrogen fertilizer and plant density. Based on parameterization, we found that RUE for prediction above ground biomass accumulation of Jatropha were 0.94 (r=0.83) g MJ-1 to 1.3 (r=0.75) g MJ-1. Validation between model prediction and field experimental data showed that model can simulate crop growth and development of Jatropha.
Highlights
Di Indonesia selama musim hujan, pengurangan intensitas dan kualitas radiasi surya sangat nyata, diduga pengurangan yang terbesar adalah dari fraksi cahaya tampak yang sangat dibutuhkan oleh tanaman (Chambers, 1978)
Values of radiation use efficiency (RUE) were determined by nitrogen fertilizer and plant density
We found that RUE for prediction above ground biomass accumulation of Jatropha were 0.94 (r=0.83) g MJ-1 to 1.3 (r=0.75) g MJ-1
Summary
DW merupakan integral laju fotosintesis menurut luas daun dan waktu yang dikurangi respirasi (R). Hubungan linier antara biomasa dan intersepsi radiasi merupakan pengamatan beberapa tanaman pertanian (Gallagher and Biscoe, 1978), spesies pohon (Linder, 1985; Grace et al 1987; Dalla-Tea and Jokela, 1991; Harrington and Fownes, 1995). Efisiensi penggunaan radiasi surya (RUE) (ε, gMJ-1) yang merupakan nisbah akumulasi biommasa tanaman dan intersepsi radiasi telah digunakan secara luas dalam analisis pertumbuhan tanaman dan produksi biomasa sebagai parameter pada beberapa model simulasi tanaman dengan lingkungan berbeda (Monteith, 1977; Gallagher and Biscoe, 1978; Jones and Kiniry, 1986; Muchow et al 1990; Sinclair, 1991; Brisson et al 2003; Kemanian et al 2004). Penelitian ini dimaksudkan untuk menetapkan efisiensi penggunaan radiasi surya Jarak Pagar, kemudian menggunakannya untuk model simulasi pertumbuhan dan perkembangan tanaman bersama-sama dengan parameter ketersediaan air dan nitrogen
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