Konstribusi Akumulasi Silikat, Nitrogen dan Aluminium terhadap Ketenggangan Aluminium dan Ketahanan terhadap Penyakit Blas pada Padi Gogo

, Bakhtiar (Jurusan Budidaya Pertanian, Fakultas Pertanian Unsyiah)
Bambang Sapta Purwoko (Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor)
, Trikoesoemaningtyas (Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor)
Iswari Saraswati Dewi (Balai Besar Bioteknologi dan Sumber Daya Genetik)

Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy)
Vol. 37 No. 3 (2009): Jurnal Agronomi Indonesia

Aluminum (Al) toxicity and blast disease are the most important yield-limiting factors for upland rice production in acid soils. The objective of this experiment was to examine the contribution of accumulation of Silicate (Si), Nitrogen (N) and Al in plant tissue on Al tolerance and blast disease resistance in upland rice. The experiment was arranged in a split-split plot design with 2 replications. Main plots were randomly assigned to blast treatment (control and inoculation to blast fungi). Subplots were assigned to control box (lime 1.5 AlEC) and another acid soils (no lime) box and sub-subplots were assigned to the tested genotypes. The result of the experiment showed that leaf blast disease resistance in rice cannot be solely explained by Si or N content in shoot tissue. The resistant to leaf blast disease might be attributed by high ratio Si/N weight in shoot. Al tolerance was ascribed by low reduction in root growth, high shoot dry weight, high Si content in shoot, and as well as high of  Si/Al ratio in root.   Key words:  Al-tolerance, blast disease, upland rice, Si/Al ratio