PowerPoint Presentation

Indices for evaluating the cropping systems

Presented by D.S.Lagoriya

Introduction Indices is using for the evaluation of various type of cropping system to decide their ability and relative advantage .Land uses efficiency It tells us about the land area use by the crops .Biological potential It tells us about the crop yield in different cropping system.Interference indicesIt tells us about the act of hindering, obstructing, Preventing movement among the different crops which is grown in a same land . Economic viability Energy efficiency

Land uses efficiency Multiple cropping index (MCI) cropping index (CI)It was proposed by Delrymple(1971) MCI is the sum of areas planted to different crops and harvested in a single year divided by total cultivated area and expressed as percentage.

Where N=total no of crops ai =area occupied by the I th crop planted and harvested within one year A =total cultivated land area available

Cultivated Land Utilization Index (CLUI)

Area & duration considered

if

If CLUI 1=land has not been left fellow >1=specifaction of inter crop or relay crop .

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n = Total number of cropsai = Area occupied by ith crop in daysdi = Duration of ith cropA = Land area available for cultivation

Crop Intensity Index (CII):

Proposed by Menegay et al (1978)It is calculated by summing the product of area and duration of each crop divided by the product of farmers total available cultivated land area and time periods plus the sum of the temporarily available land area with the time of these land areas actually put into use.

Where, I = 1, 2, 3NC, NC = total number of crops grown by a farmer during the time period. T, ai = area occupied by ith crop (months that the crop I occupied an area ai) T = time period under study (usually one year), AO= Total cultivated land area available with the farmer for use during the entire time period, T, M= total number of fields temporarily available to the farmer for cropping during time period. T, j=1, 2, 3.. M, Aj=land area of jth field and Tj= time period Aj is availableCrop intensity index assesses farmers actual land use in area and time relationship for each crop or group of crops compared to the total available land area and time, including land that is temporarily available for cultivation.CII =1 resource have been fully utilized CII= 1 yield advantage . = 1 no gain and loss < 1 yield loss Interference indices Relative Crowding Coefficient (de Wit 1960)This is one of the competition function For replacement series of intercropping ,whether the component has produced more or less yield in intercropping than expected.

Yab ZbaRCCa (Ka)=-------------- x ---- (Yaa xYab) Zab

Where RCCa = Relative Crowding Coefficient of component aYaa, Yab = Yield of a in sole cropping and intercropping.Zab, Zba = Sown proportion of a and b in intercropping.RCC 1 - More yield than expected

To determine whether there is yield advantage, the product of two coefficients (K) is arrived at.

If K = 1, there is no advantage, If K > 1, there is yield advantage If K < 1, there is yield loss due to intercroppingAggressivity (Mc Gilchrist, 1965)

It gives a simple measure of the relative competitiveness of the component crops.

Yab YbaAab= -------- - ------------- Yaa x Zab Ybb x Zba

When A = Zero indicates that the component crops are equally competitive = Positive value indicates more competitive than the other species Aggressivity values do not indicate yield advantage.

Competition Ratio (Willey and Rao, 1980)

CR indicates the proportion of actual yield to expected yield and the degree of competitiveness of the species. It is the ratio of LER'S of the component crops corrected for the proportion in which they are sown in intercropping.

Yab YbaCRb = ------------- = ------------- Ybb x Zba Yaa x Zab

Yab YbaCRa=--------- = ---------- Yaa x Zba Ybb x Zab

Net return Gross return cost of cultivation

Benefit cost ratio = Gross return Cost of cultivation

Per day return= net return crop duration Energy efficiency

Energy efficiency = Energy out put(mj/ ha) Energy in put (mj/ha)

THANK-UD.S.Lagoriya