21. In 1843, Agricultural Experiment Station at Rothamsted, England was started by
22. Which of the following nutrients is available at neutral pH value?
23. One atmosphere means
24. ATP consumption (photosynthesis) & production (respiration) are which kind of reaction respectively?
25. Biogas contain . . . . . . . . % of N.
26. C-axis spacing of illite is
27. . . . . . . . . toxicity is probably the important growth limiting factor in acid soils, particularly when pH < 5.0 to 5.5
28. Passive factor of soil formation includes
29. Indicator plant for monitoring K-deficiency is
30. Which one of the following occupies the highest volume percent in a fine sandy loam surface soil in good condition for plant growth?
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