Abstract
Iron (Fe) deficiency limits crop production on black calcareous soils (Typic Calciustolls) of Thailand with reports of Fe deficiency becoming more common. Much of the Fe in these soils occurs as free crystalline and amorphous Fe oxides and DTPA extractable Fe is low averaging 6. 4 mg/kg in 20 soils examined. Field studies showed that Fe deficiency could be alleviated by soil amendments such as elemental sulfur or by soil and foliar Fe fertilizer, provided rates of application were high enough. However, since soil amendment and Fe fertilizer use is costly, preliminary research into cultivar selection for Fe efficiency has begun with peanuts. Kernel yields in 20 cultivars were inversely related to Fe chlorosis scores. Standards for diagnosis and prediction of Fe deficiency in field crops are being developed for soil and plant analyses using DTPA and o‐phenanthroline, respectively.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
