Availability of soil arsenic (As) and plant As at various levels of zinc (Zn) and As applications were examined. A pot-culture experiment with a leafy vegetable, Kalmi (Ipomoea aquatica), on an Inceptisols, was conducted where As was applied with irrigation water at the rates of 0 mg/L (As control), 0.5 mg/L, 1 mg/L and 2 mg/L and Zn was added to the soil as ZnCl 2 solution at the rate of 0 mg/L (Zn control), 1 mg/L, 2 mg/L and 3 mg/L during pot preparation. The experiment was conducted in triplicates for 45 days till the plants were grown to maturity. At the end of the experiment the remedial effect of Zn on As toxicity was examined and as such, yield parameters, As and Zn accumulation in Kalmi plants, residual concentrations of As and Zn in soils and plants were measured. It appeared from the present study that there exists an antagonistic relationship between Zn and As i.e., Zn in soils was found to reduce As availability in soils as well as its accumulation in plants, particularly at an elevated application rate of 3 mg/L Zn. The findings could be used as a strategy to mitigate arsenic toxicity in As contaminated soils.
To reduce the loss of nitrogen and to improve cost effectiveness as well as plant nitrogen content, a humic acid coated urea fertilizer, called Black Urea is used in the present experiment. Four sets of pot experiment was conducted here to compare the efficiency of black urea fertilizer over conventional white urea. Kalmi, a fast growing, leafy vegetable, was allowed to grow for 60 days to carry out this experiment. After harvesting, both the root and shoot growth of the plants for all four sets of experiment and the available N and P content was calculated. In addition to that plant protein content was analyzed to draw the conclusion undoubtedly. Black urea was evidenced to posses better efficiency over white urea fertilizer as far as the nutritional quality and cost of the experiment was concerned.
The effects of sugar mill mud application on the availability of nutrients for plant uptake were investigated. Mill mud generated from conventional sugar mill operations was applied in three different rates and a leafy vegetable, locally called "PuiShak" or Indian spinach (Basellarubra L.) was grown for 60 days as a test crop in a pot culture experiment. Crop yield and essential nutrients like N, P, K and Zn uptake concentration was determined to come up with an inference that higher doses of mill mud application impose better effect on root and shoot uptake of these elements. A little infraction was observed for nitrogen uptake by plants for the maximum dose.
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