I. P. Pradhan , Rajbans Dayal

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K. K. M. Nambiar , Rajbans Dayal , P. R. Mishra

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A quantitative evaluation of soil structure in terms of mean-weight-diameter of the aggregates has been done under Cenchrus ciliaris, Dichanthium annulatum and Aristide hystrix in comparison to that under over-grazeda area. The m-W-ds of the aggregate distribution obtained at 0-15 cm; 15-80 Cm; 30-45 cm; and 45-60 Cm depths under Cenchrus ciliaris are 1.400 mm; 0.550 mm 0.880 and 0.264 mm; respectively, and under Dichanthium annulatum, 1.407 mm; 0.504 mm; 0.252mm; and 0.870 mm. The m-w-ds of the aggregate distribution in the surface layers of Cenchrus ciliaris and Dichanthium annulatum are mare than five times the m-w-d of the aggregate distribution in the surface layer of the over-grazed area. The m-W-d of the aggregate distribution under the annual Aristida hystrix thrice that in the case of over-grazed area. The extent of soil aggregation in the surface and sub-surface soils remains to be the same the under over-grazed area. Studies further revealed that the diameter, spread, and vertical extent of the ischolar_mains play a major role in soil aggregation in deeper layers of the profile.

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S. N. Bhola , Gurmei. Singh , Rajbans Dayal

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On the basis of physical and chemical characteristics and morphological features of different soil profiles studied in different parts of the region, the soils of Kota have been classified into two different series, namely Kota clay (Dark Gray Brown) and Kota Clay loam (Brown). Out of eighty five profiles studied in different parts of the region, the two representing the two soil series established have been described. The clay content and the fertility status in case of Kota Clay series is higher as compared to that of Kota Clay loam series. The physical constants and different ratio like erosion ratio, dispersion ratio, etc., show that Kota clay soils are nearly non-erosive but for their property of cracking and are poorly drained, while Kota clay loam soils are more erosive in nature and are moderately well drained. The buffering curve reveals that the Kota clay soils have 3.5 times higher buffering capacity as compared to that of Kota clay loam ones.

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A. Singh , C. M. Shah , Rajbans Dayal

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Fourteen years rainfall data of self recording raingauge available at Soil Conservation Research Demonstration and Training Centre, Vasad have been analysed and discussed in this paper. Average annual rainfall at Vasad is 826 mm with average number of forty rainy days. It has been found that over 97 per cent of rainfall is received in the months from June to September. Probability and frequency analysis of the rainfall data have also been done and are reported for tentative use.

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I. P. Pradhan , Rajbans Dayal

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Various types of continuous, staggered contour trenches and pits were tried at Soil Conservation Research Farm. Vasad, for afforestation with Acacia arabica (Willd). Staggered contour trench of 3 m × 45 cm × 60 cm depth with raised mound of 1 m × 60 cm height (T4) was found to be the most suitable one giving mean height of 452.67 cm and diameter (collar), of 7.52 cm at the end of fourth year. It was followed by staggered contour trench of 3 m × 30 cm × 45 cm depth with raised mound of 1 m × 45 cm height (T3) and continuous contour trench of 30 cm × 45 cm depth with raised mound of 1 m × 30 cm height (T2)

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