1.
The most abundant metal in the earth’s crust and toxic to plants in low concentration is____________________?
2.
Point of zero change means____________________?
3.
Part of soil which is in contact with root surface is called___________________?
4.
Examples of macrobiota are______________________?
5.
Which bacteria convert nitrite to nitrate___________________?
6.
In flood rice, snail feed on bacteria called__________________?
7.
Humic acid is soluble in____________________?
8.
Which mulch reduce soil temperature?
9.
The tree sends down roots from its branches to the soil is know as:_______?
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