Comparative Evaluation of Colemanite and Sodium Pentaborate as Boron Sources for Rice Grown in Flooded Calcareous Soil

Abstract

Boron insufficiency in the agricultural soils is common and wide spread problem in many regions of the world. The effectiveness of crushed ore colemanite as B sources for rice crop under flooded calcareous soil were evaluated in a glass house study. We studied the effects of powder colemanite (PC) and granular colemanite (GC) in comparison with the refined sodium pentaborate fertilizer at the rates of 0, 1, 2, and 3 kg B ha -1 on growth and yield parameters of rice crop as well as the true control (0 kg B ha -1 ). Sodium pentaborate (SP) and (PC) application of 2 and 3 kg B ha -1 significantly increased the plant height, number of tillers and panicles per plant, number of grains per panicle, weight of 1000 grains and B concentration in grain compared the 0 and 1 kg B ha -1 . Rice crop with SP and PC applied at 3 kg B ha -1 produced significantly (18% over the control) higher grain yield than the 0 kg B ha -1 treatment. Pots fertilized with SP and PC produced similar results as grain yield difference between them was not significant so these B fertilizers were very effective in supplying B to rice crop, but GC applied pots produced significantly low yield because of its bigger particle size, due to which B was not released from fertilizer. This study proved that colemanite with smaller particle size is an effective B source and it is cheaper than refined products so it should be applied for harvesting higher yields.

PENGARUH APLIKASI SILIKA DAN BORON TERHADAP PERTUMBUHAN DAN PRODUKSI TANAMAN PADI (Oryza sativa L.)

“…Hasil penelitian ini juga sesuai dengan hasil penelitian Khan et al (2011) yang melaporkan bahwa pemberian boron pada tanaman padi dapat meningkatkan jumlah anakan dan jumlah malai tanaman padi. Menurut Sarki et al (2013), peningkatan jumlah malai pada tanaman padi dipengaruhi oleh boron dalam reproduksi tanaman dan perkecambahan serbuk sari sehingga boron mendorong pertumbuhan tabung polen.…”

“…Bobot gabah isi mencapai optimum dan memiliki jumlah gabah isi terbanyak pada perlakuan yang diberi silika 400 mg kg -1 dan boron 10 mg l -1 yaitu 35,01 g (Tabel 10). Dalam masing-masing penelitiannya Hyder et al (2012) dan Kim et al (2012); Sarki et al (2013) melaporkan bahwa boron maupun silika dapat meningkatkan jumlah gabah isi dan bobot gabah isi.…”

“…Tabel 9 menunjukkan bahwa tanaman padi yang tidak diberi silika dan boron memiliki jumlah gabah hampa terbanyak yaitu 1184,75 butir rumpun -1 , sedangkan jumlah gabah hampa terkecil terdapat pada tanaman yang diberi silika 400 mg kg -1 dan boron 5 mg l -1 yaitu 159,82 butir. Hasil penelitian yang sama juga dilaporkan oleh Malidareh et al (2011) dan Sarki et al (2013) bahwa silika maupun boron dapat meningkatkan gabah isi dan menurunkan gabah hampa.…”