Effect of Lime, Humic Acid and Moisture Regime on the Availability of Zinc in Alfisol

Abstract

Lime and humic acid application can play an important role in the availability of zinc in paddy soils. We conducted laboratory incubation experiments on a rice growing soil (Alfisol) to determine the effect of lime, humic acid and different moisture regimes on the availability of Zn. Addition of half doses of liming material (powdered lime stone) recorded highest values of DTPA-Zn followed by no lime and 100% of lime requirement throughout the incubation period. With the progress of incubation, DTPA-Zn increased slightly during the first week and then decreased thereafter. The highest DTPA-extractable Zn content of 2.85 mg/kg was found in the treatment Zn10 L1/2 at 7 days of incubation, showing 17.3 % increase in DTPA-Zn content over its corresponding treatment of Zn alone (Zn10L0). The DTPA-Zn concentration increased with the application of humic acid compared with no humic acid throughout 35 days of the incubation period and the peak value obtained was 3.12 mg/kg in the treatment Zn10 HA2 at 14 days after incubation, showing 50 % increase in Zn content over its corresponding treatment of Zn alone (Zn10HA0). The application of 0.2% humic acid compared with 0.1% resulted in greater increase in DTPA-Zn concentration in soil application. During the 35 days of incubation, highest values of DTPA-Zn were recorded in soil maintained at saturated compared to water logged conditions. However, under alternate wetting and drying condition the DTPA-Zn content gradually decreased up to 21 days and thereafter increased slowly.

A pedological study attempting to combine soil taxonomy and WRB classification systems

“…Total carbonate contents vary widely between 0.4 and 16.8%, and have the same distribution of gypsum with depth. Lime plays an important role and affects nutrient availability to plants (Naik and Das, 2007). Chemical properties data (Tab.…”

The Effect of Humic Acid and Zinc Application on Shoot Dry Matter Yield and Zinc Amount in Pepper (Capsicum annuum L.)

“…En fazla ortalama Zn miktarı HA 200 mg kg -1 uygulamasında 47.30 mg kg -1 olup kontrole kıyasla %18 artış gösterdiği saptanmıştır. Yapılan bir çalışmada çeltik bitkisinde yürütülen inkübasyon denemesinde toprağa humik madde ilavesi ile toprakta Zn yarayışlılığının artığı, bitkilerin Zn kapsamlarında ki artışın daha yüksek miktarlarda olduğu belirlenmiştir (Naik ve Das, 2007).…”

Humik Asit Uygulamalarının Toprak Özellikleri ile Makro Besin Elementi, Mikro Besin Elementi ve Ağır Metal İçerikleri Üzerine Etkisi

“…According to Sönmez and Bozkurt (2006) with their work with humic acid applications of heavy metals from waste bioavailability can be limited. Naik and Das (2007) reported the highest increase in DTPA-Zn content with 0.2% humic acid.…”