Informatics Publishing Limited

Y. Agnihotri , M. C. Agarwal , Nirmal Kumar

Abstract

The efficiency of various Latin Square Designs (LSD) relative to the Complete Randomised Designs (CRD) and Randomised Complete Block Design (RCBD) for various sizes and shapes of plots with height and diameter at breast height (D.B.H.) of Eucalyptus in Shiwalik hills were worked out. The relative efficiency (percentage) of 3 × 3, 4 × 4,5 × 5 and 6 × 6 LSD for different plot sizes and shapes compared with CRD and RCBD when rows are treated as blocks (ignoring columns) and when columns are treated as blocks (ignoring rows) have been computed. The number of units required in CRD and RCBD taking rows as blocks or columns as blocks for obtaining the relative efficiency equivalent to that of3 × 3 to 6 × 6 LSD were also evaluated and it was found that LSD was more efficient than CRD and RCBD for experimentation with Eucalyptus trees height and D.B.H. in Shiwalik hills.

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Y. Agnihotri , M. C. Agarwal

Abstract

An uniformity trial for determination of optimum size and shape of plots and blocks was conducted on 8 years old plants of Acacia catechu (spacing 2m × 2m) at the Central Soil and Water Conservation Research and Training Institute, Research Centre, Chandigarh. Height and GBH data of all the individual plants were recorded in 24 × 24 compartment and analysed for determination of optimum plot and block sizes for conducting field experiments. A plot of size 8-12 plants appears to be optimum. Smith equations fitted well in the CV and plot size data and indicated the neighboring plots to be uncorrelated. For a fixed size of plot, its shape did not indicate any consistent effect on CV. In general, blocks were found to be more efficient than without blocking arrangement.

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Y. Agnihotri , M. C. Agarwal

Abstract

Investigations on the optimum size and shape of plots and their arrangement in blocks have been made with Dalbergia sissoo (Roxb.) at the Research Farm of the Central Soil and Water Conservation Research and Training Institute, Research Centre, Chandigarh situated in lower Ambala ShiwaIik foothills. Height and diameter (bh) observations of all the individual trees spaced at 2m × 2m in 24 trees × 24 trees compartment were recorded. Coefficient of variation (CV) of different sizes and shapes of plots and blocks were worked out and used for determination of optimum size and shape of plots and blocks. A plot having 8-12 trees was considered to be optimum size. Blocks in general, were found to be more efficient tban without blocking arrangements. Bigger blocks were less efficient than small blocks.

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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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S. S. Sajwan , Kehar Singh , Y. Agnihotri , P. R. Misiira

Abstract

Study on forage yield under three situations viz. Acacia catechu plantation, Eucalyptus hybrid plantation and open grassland was done at the soil Conservation Research Station, Manimajra (Chandigarh), representative area of lower Ambala Siwalik Plateau, in November 1973. Observations on herbage yield, basal area and height of dominant species were recorded and I,V.I. was calculated. Maximum green forage yield (123.5 q/ha) has been recorded under Acacia catechu plantation of 1964 with a specing of 5m × 5m. Minimum green forage yield (73.74 q/ha) bas been recorded under Eucalyptus hybrid plantation of 1964 with a spacing of 1.6m × 1.6m.

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Y. Agnihotri , S. C. Gupta

Abstract

On the basis of thirty four years available rainfall data, it has been found out that average annual rainfall of Agra is 713.7 mm and average no of rainy days is thirty four. It has been observed that 90.5% Of the annual rainfall is received in the month. From June to September. A straight line relation between the frequency factor K and annual rainfall X has been found to exist as K=-2.665 + 2.388 X. Data for seven years, have revealed 61 % of annual rainfall to occur during day and the remaining at night. One year out of every six years is expected 10 be a drought year.

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