Mohammad Nazrul Islam

10 Questions 18 Answers 0 Followers

Questions related from Mohammad Nazrul Islam

How can we measure the exchangeable Na, K, Ca in soil?

Normally we measure Na and K using 1M NH4OAC. Someone say it is exchangeable Na and K. On the other hand, someone say it is available (water soluble+exchangeable) Na and K. I am confused which one...

12 April 2017 4,845 19 View

What is the critical limit of ESP?

We know that every nutrient has a critical limit for rice. But I need to know about critical limit of exchangeable sodium percentage (ESP) for rice. I have found from a literature that its value...

18 March 2017 10,019 13 View

What is the effect of excess sulphur on rice plant?

If the soil has more than 50 ppm available S, what will be the impact on rice plant? What is the permissible limit of soil available S for rice plant? It is notable that soil pH is >5.8 and...

20 February 2017 9,361 19 View

What is the effect of excess magnesium on rice plant?

What is the permissible limit of soil exchangeable Mg for rice plant? More than 15 Cmol/kg is toxic to rice plant?

20 February 2017 1,801 3 View

Why different pH meters give different value of the same sample?

We have 3 pH meter, all of them give same value in buffer solutions (4, 7 and 10). But these pH meters give different values in same soil sample. For example, the values of same soil sample are...

20 December 2016 6,943 16 View

How much sodium is absorbed by rice plant tissue from saline-sodic soil?

We conducted a research in saline-sodic soil, where soil having ESP 12.2, SAR 15.3, EC 7 dS/m and soil was silt clay in texture. We found that total uptake (at ripening stage of rice) of Na was...

28 November 2016 5,683 16 View

What are the effects of MgSO4 on physical properties of saline soil?

There are some kinds of salt present in saline soil. As far I know, Na salt is more harmful than others. But I have no idea about effect of Mg salt (MgSO4) on soil health. What are the permissible...

18 November 2016 2,002 15 View

What are the combine effects of salinity and water logging on soil health and plant growth and development?

Excessive water may, however, induce high water tables, which, if saline, contribute to soil salinity. Water logging in combination with high salinity can cause greater depression in growth and...

09 November 2016 4,009 6 View

What are the reasons for variation in rice yield between wet and dry seasons at same levels of phosphorous deficit conditions?

We have P deficit (2 to 4 ppm available P, Olsen) research field. We cultivated rice in wet (rainy and warmer) and dry (cold) season. We found that rice yield drastically reduced in dry season....

09 November 2016 6,010 7 View

What are the possible amendments (organic and/or inorganic) for saline soil?

Some researchers found gypsum amendment is a way to reduce salinity, but it is not suitable for all types of soil. Some researcher reported that ash from rice straw and rice husk may mitigate soil...

25 October 2016 5,791 33 View