System Yields, Nutrient Uptake and Balance of Mustard-Mungbean-T. Aman Rice Cropping Systems in Terrace Soils of Bangladesh
Md. Abdul Quddus,
Md. Joinul Αbedin Mian,
Habib Mohammad Naser,
Md. Ashraf Hossain,
Md. Abdus Sattar
Issue:
Volume 6, Issue 2, April 2017
Pages:
14-23
Received:
20 February 2017
Accepted:
20 March 2017
Published:
10 April 2017
Abstract: Conducted experiments on mustard-mungbean-T. aman rice cropping system to measure the system yield, nutrient uptake and apparent balance in terrace soils of Gazipur. Four fertilizer treatments were considered viz. absolute nutrient control (T1); farmer’s practice (T2); AEZ basis fertilizer application (T3) and soil test basis fertlizer application (T4). The treatments were compared in a randomized completely block design with three replications over two consecutive years. The average yields of mustard, mungbean and T. aman rice ranged from 798 to 1543 kg ha-1, 995 to 1489 kg ha-1 and 3270 to 4521 kg ha-1, respectively showing T4 as the best treatment. Soil test basis fertilizer application (T4) exhibited the highest nutrients uptake by all tested crops. The apparent balance of N and K was negative; however it was less negative for T4 treatment. The apparent P balance was positive in T2, T3 and T4 but negative in T1. Positive S balance observed in T4 but negative in T1, T2 and T3. Zinc and B balance in the system was positive in case of T3 and T4. Highest yield, gross margin and soil fertility have been recommended that the soil test basis fertilizer application is profitable for mustard-mungbean-T. aman rice cropping system in terrace soils. The study indicate clearly an opportunity for the re-adjustment of the N, P, K, S and miconutrients (Zn & B) fertilizer doses for the different rice-based cropping systems in Bangladesh.
Abstract: Conducted experiments on mustard-mungbean-T. aman rice cropping system to measure the system yield, nutrient uptake and apparent balance in terrace soils of Gazipur. Four fertilizer treatments were considered viz. absolute nutrient control (T1); farmer’s practice (T2); AEZ basis fertilizer application (T3) and soil test basis fertlizer application ...
Show More
Adsorption Removal of Inhibiting Compounds by Modified Activated Carbon
Hao Ma,
Xingxiang Ji,
Zhongjian Tian,
Guigan Fang,
Guihua Yang
Issue:
Volume 6, Issue 2, April 2017
Pages:
24-30
Received:
10 May 2017
Published:
10 May 2017
Abstract: The effects of modification on the surface properties and inhibiting compounds (formic acid, acetic acid, 5-hydroxymethylfurfural and furfural) removal performance of activate carbon (AC) were investigated. The raw and modified ACs were characterized, the result showed that the surface chemistries of the modified ACs were significant changed, but only the porous structure of modified by HNO3 were slightly damaged, and the others no obvious change. The formic acid and acetic acid removal performance of modified AC had a certain amount of improvement compared to the raw AC, but it is still relatively low (15% and 14%), so AC adsorption is not suitable for removal formic acid and acetic acid. And the 5-hydroxymethylfurfural (5-HMF) and furfural removal performance of modified AC by ZNCl2 is good (89% and 81%). the process of adsorption of 5-HMF and furfural by activated carbon belongs to the process of exothermic physical adsorption and is the entropy reduction process. The adsorption is best carried out at low temperature.
Abstract: The effects of modification on the surface properties and inhibiting compounds (formic acid, acetic acid, 5-hydroxymethylfurfural and furfural) removal performance of activate carbon (AC) were investigated. The raw and modified ACs were characterized, the result showed that the surface chemistries of the modified ACs were significant changed, but o...
Show More
