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Change of oxalate form in pot‐grown napiergrass ( Pennisetum purpureum Schumach) by application of calcium hydroxide
Author(s) -
Rahman Mohammad Mijanur,
Ishii Yasuyuki,
Niimi Mitsuhiro,
Kawamura Osamu
Publication year - 2009
Publication title -
grassland science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 19
eISSN - 1744-697X
pISSN - 1744-6961
DOI - 10.1111/j.1744-697x.2009.00132.x
Subject(s) - pennisetum purpureum , oxalate , chemistry , potassium , zoology , cutting , dry matter , agronomy , forage , horticulture , inorganic chemistry , biology , organic chemistry
Oxalate interferes with the absorption of calcium (Ca) in livestock. However, insoluble oxalate, which presents mostly as a complex combined with Ca, is not considered to be a problem in ruminants. The objective of this study was to test the possibility of increasing insoluble oxalate content in plants by increasing Ca supply in pot‐grown napiergrass ( Pennisetum purpureum Schumach). The plants were cut three times at approximately 2‐month intervals from summer to autumn. Four treatments (0, 30, 60 and 90 g m −2 ) of Ca(OH) 2 were applied in three equal split doses: before transplanting and soon after the first two cuttings. At almost all of the cuttings, soluble oxalate in forage showed a decreasing trend and insoluble oxalate and Ca concentration showed a reverse trend with an increased rate of Ca(OH) 2 application. Averaged over the three cuttings, the 90‐g Ca(OH) 2 treatment was most effective in reducing soluble oxalate by increasing insoluble oxalate, with significant ( P < 0.05) differences between the 0‐ and 90‐g Ca(OH) 2 treatments. However, total oxalate content was not affected ( P > 0.05) by the rate of Ca(OH) 2 application. Moreover, Ca(OH) 2 application did not affect dry matter yield and the concentrations of magnesium, potassium and sodium of plant material. It may be concluded that the level of soluble oxalate in plants can be partially replaced by formation of insoluble oxalate using Ca(OH) 2 fertilizer.