Pratap Singh , Y. Agnihotri , S. P. Mittal , P. R. Mishra

Abstract

For determining the optimum size and thickness of polythene bags, four sizes viz. 25 cm × 15 cm, 30 cm × 20 cm, 40 cm × 25 cm and 45 cm × 30 cm with gauges 150, 200 and 250 have been tested for raising nursery of Eucalyptus hybrid. Data on height, collar-diameter and other growth parameters like leaves per plant, length of ischolar_main and dry weight of entire plant was taken 90, 120, 150 and 180 days after sowing of seeds. The data showed consistent concomitant increase in the growth parameters with increasing size and thickness of polythene bags. On considering the cost and gross return from six year old plantation raised from the seedlings in the bags under test, optimum size and thickness of bag works out to 40 cm × 25 cm with 200 gauge followed by 45 cm × 30 cm with 150 gauge.

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K. N. Sinha , P. R. Mishra

Abstract

Studies on soil and its moisture conditions revealed some of the probable causes of failure of bamboo in sandy soil of Purnea and Bettiah Districts of Bihar. The investigation revealed that the success of any species on a particular soil depends largely on the degree of positive correlation of its initial ischolar_main system with the moisture content of the soil. Deep ischolar_mained species fulfil this promise in areas where soil of the upper layers is porous, coarse and non-retentive of moisture and as such are the most adaptable ones to the area under examination.

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P. R. Mishra , Rajhans Dayal , S. N. Bhola

Abstract

The Importance of case study in watershed research has been discussed in this paper. It is an important tool to explain the complex interrelationship between various factors and processes towards developing clearer understanding to the functioning of a watershed under different land treatments. Case study as an important tool of Scientists in invention and discovery, its wide adoption as a scientific method of research in some of the biological sciences, its scope in watershed research and its advantages over statistical method of research have been high-lighted. The paper advocates its adoption in watershed research.

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S. N. Bhola , Rajbani Dayal , P. R. Mishra

Abstract

The paper presents the results of a study about the rate of loss of available soil water through evaporation and evapo-transpiration under field conditions in a clay loam soil under three different treatments at the Soil Conservation Research Centre, Kota (Rajasthan). Gypsum blocks were embedded at 15 cm, 30 cm, 45 cm and 90 cm depths and the available moisture per cent was recorded with the help of Bouyoncos moisture meter. A conversion factor for converting the loss of available water into mm/day/30 cm depth was calculated and found to be 0.438 mm for unit available moisture per cent.Average daily loss of available moisture in hoed plots with no plants works out to be 0.0617 mm/day/30 cm depth only as against 0.4755 and 0.320 mm/day/30 cm depth in hoed plots with tobacco plants and in cultivated fallow respectively. The losses by evaporation and by transpiratlon in hoed plots with tobacco plants have been segregated. The transpiration loss in available moisture per cent per day was found to be 3.0, 1.55 and 2.38 for 15 cm, 30 cm and 45 cm depths respectively, while evaporative loss alone was recorded to the tune of 1.28, 0.20 and 0.048 per day. The study shows that the available water was saved to the tune of 72.87 mm (2.83 inches) up to 90 cm depth by hoeing.

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D. P. Handa , P. R. Mishra

Abstract

Analytical presentation of 75 years of rainfall data of Kota has been attempted in this paper. Variability of annual rainfall, its trend, annual and monthly distribution together with the maximum intensity of different storms ranging from 5 minutes to 60 minutes duration have been presented. The analysis indicates a slight increasing trend in the annual precipitation. While there is a wide variability in rainfall from year to year and from month to month, the study reveals a better consistency in the distribution of rainfall during Kharif season, while during Rabi season the variability in distribution is much more. There appears to be no hope for increasing production without adequate measures for conserving water and without providing irrigation facilities in the region.

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

Abstract

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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K. Roy , P. R. Mishra

Abstract

It has been attempted in this paper to explain the formation of deep ravines in semi-arid region along the river Chambal and its tributaries in almost flat aluvial plains, having high percentage of clay that has low dispersion co-efficient. The role of river depth, meandering, confluence, pot holes, cracks and the catchment to the formation of ravine has been critically examined. The process of scouring greater than the process of silting in the river and its tributaries in deep alluvial plains has been found to be the main reason of the deepening of the river that has a direct bearing on the depth of ravine. It has been revealed that ravine has a separate identity than a net work of gullies. While the former as the function of the river depth remains invariably confined to the vicinity of the river and tributaries and proceeds from the river bank to the agricultural fields the latter is the function of the catchment, distinguished by longitudinal development and proceeds from upland to the river or lowlying areas.

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