Question

HUT (Higiei Uruer Thinking skills) Questions:
1. What would have happened if there was no greenhouse effect?
2. How does excessive use of fertilisers cause eutrophication?
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Answer 1

Answer:

1) if there was no greenhouse effect then the temparature of the will not be suited for us to live. Days would have been very hot and nights would have been very cold ( - temperature could been in Tamil Nadu )

2) when fertilisers are used excessively the fertilisers will mix with the nearby water bodies and the soil will lose its capacity of holding the fertilisers. when the fertilisers mix with the water bodies it helps the growth of algae( algae is also a plant according to the classification of plants).This causes eutrophication

Answer 2

Answer:

The interactive effects of soil texture and type of N fertility (i.e., manure vs. commercial N fertilizer) on N(2)O and CH(4) emissions have not been well established. This study was conducted to assess the impact of soil type and N fertility on greenhouse gas fluxes (N(2)O, CH(4), and CO(2)) from the soil surface. The soils used were a sandy loam (789 g kg(-1) sand and 138 g kg(-1) clay) and a clay soil (216 g kg(-1) sand, and 415 g kg(-1) clay). Chamber experiments were conducted using plastic buckets as the experimental units. The treatments applied to each soil type were: (i) control (no added N), (ii) urea-ammonium nitrate (UAN), and (iii) liquid swine manure slurry. Greenhouse gas fluxes were measured over 8 weeks. Within the UAN and swine manure treatments both N(2)O and CH(4) emissions were greater in the sandy loam than in the clay soil. In the sandy loam soil N(2)O emissions were significantly different among all N treatments, but in the clay soil only the manure treatment had significantly higher N(2)O emissions. It is thought that the major differences between the two soils controlling both N(2)O and CH(4) emissions were cation exchange capacity (CEC) and percent water-filled pore space (%WFPS). We speculate that the higher CEC in the clay soil reduced N availability through increased adsorption of NH(4)(+) compared to the sandy loam soil. In addition the higher average %WFPS in the sandy loam may have favored higher denitrification and production than in the clay soil.