crop index equation

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294 0 R /Next 303 0 R /Dest (Section1) /Title (Introduction) >> endobj 296 0 obj << /Parent 294 0 R /Dest (Section11) /Prev 297 0 R /Title (References) >> endobj 297 0 obj << /Parent 294 0 R /Next 296 0 R /Dest (Acknowldgment) /Prev 298 0 R /Title (Acknowledgments) >> endobj 298 0 obj << /Parent 294 0 R /Next 297 0 R /Dest (Section10) /Prev 299 0 R /Title (Conclusions) >> endobj 299 0 obj << /Parent 294 0 R /Next 298 0 R /Dest (Section9) /Prev 300 0 R /Title (Discussion) >> endobj 300 0 obj << /First 301 0 R /Parent 294 0 R /Next 299 0 R /Dest (Section5) /Count 3 /Last 302 0 R /Prev 303 0 R /Title (Results) >> endobj 301 0 obj << /Parent 300 0 R /Next 306 0 R /Dest (Section6) /Title (Spring barley) >> endobj 302 0 obj << /Parent 300 0 R /Dest (Section8) /Prev 306 0 R /Title (Sorghum) >> endobj 303 0 obj << /First 304 0 R /Parent 294 0 R /Next 300 0 R /Dest (Section2) /Count 2 /Last 305 0 R /Prev 295 0 R /Title (Materials and methods) >> endobj 304 0 obj << /Parent 303 0 R /Next 305 0 R 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��`�f�YP��YJJ`�4�j����S^ �$ ���1�3�`��R���SA�A�!������B: ���07�}�= s��!��� ���� � S};�X6p:5�4x3La�`� %����0�Q���ʪ2x�ex�3j00������������������S�NAi�}�C&� 0000005620 00000 n 0000019913 00000 n It is the ratio of the leaf of the crop to the ground area over a period of interval of time. It includes all crops except fodder crops. * A Laspeyres Index is known as a "base-weighted" or "fixed-weighted" index because the price increases are weighted by the quantities in the base period. 0000015099 00000 n The value of LAI should be optimum at the maximum ground cover area at which crop canopy receives maximum solar radiation and hence, the TDMA will be high. 0000017369 00000 n Limitations and Exceptions: The FAO indices may differ from those produced by the countries themselves because of differences in concepts of production, coverage, time periods, weights, time reference of data, methods of calculation, and use of international prices. 0000010540 00000 n 0000006695 00000 n Africa High salt levels hinder water absorption, inducing physiological drought in the plant. Vegetation Condition Index - VCI Kogan [5] proposed a vegetation condition index based on the relative NDVI change with respect to minimum historical NDVI value. 0000004288 00000 n 0000009399 00000 n 0000005062 00000 n Growth formula of crops 1. Crop growth rate is a measure of the increase in size, mass or number of crops over a period of time. ), which tend to impact the results. 0000006027 00000 n Let’s examine NDVI for an agricultural area with center pivot irrigation. Where: S - is the taxonomic subgroup class of the series of the soil map unit (MU), For the main two livestock subgroups, namely, meat and milk, only feed originating from the respective subgroup is removed. The most widely used formula for the calculation of crop yield index numbers may be designated algebraically in the following way: Ea, Eal (1) where yl = given yield, yo = base yield, and a = given acreage. Crop Monitoring updates scouting by using NDVI to find problem areas in the field and sending scouts directly to the exact location, thus saving time and resources. Processed and semi-processed feed items such as bran, oilcakes, meals and molasses have been completely excluded from the calculations at all stages. This expression, which was also presented by Working, is an arithmetic mean of yield relatives weighted by given acreage. Definition: Crop production index shows agricultural production for each year relative to the base period 2004-2006. 0000010444 00000 n trailer << /Size 392 /Info 283 0 R /Root 288 0 R /Prev 768068 /ID[<310b26cc0c5478d08cc7d8fb347e03a5><310b26cc0c5478d08cc7d8fb347e03a5>] >> startxref 0 %%EOF 288 0 obj << /PageMode /UseOutlines /Names 291 0 R /Outlines 293 0 R /Metadata 282 0 R /Pages 281 0 R /PageLayout /SinglePage /OpenAction [ 292 0 R /FitH 910 ] /Threads 289 0 R /Type /Catalog /PageLabels 279 0 R /FICL:Enfocus 284 0 R >> endobj 289 0 obj [ 290 0 R ] endobj 290 0 obj << /F 325 0 R /I << /Title (Main_Text)>> >> endobj 291 0 obj << /Dests 208 0 R >> endobj 390 0 obj << /S 366 /T 609 /O 663 /E 679 /L 695 /Filter /FlateDecode /Length 391 0 R >> stream 0000005509 00000 n Statistical Concept and Methodology: The agricultural production index is prepared by the Food and Agriculture Organization of the United Nations (FAO). The value of LAI should be optimum at the maximum ground cover area at which crop canopy receives maximum solar radiation and hence, the TDMA will be high. maize, potatoes, milk, etc.). 0000010156 00000 n Crop yield is the measurement most often used for … The secondary sources cover official country data from websites of national ministries, national publications and related country data reported by various international organizations. They are based on the sum of price-weighted quantities of different agricultural commodities produced after deductions of quantities used as seed and feed weighted in a similar manner. 0000015427 00000 n 0000007365 00000 n The CSR2 equation and description of the six components used to calculate the productivity of each soil map unit is posted on the Soil and Land Use website at /soils/suitabilities-interpretations; The equation is: CSR2 formula: CSR2 = S-M-W-F-D ± EJ. In many countries much agricultural employment is informal and unrecorded, including substantial work performed by women and children. With weather, environmental and production variables to consider, the only thing growers can count on is uncertainty. 0000040775 00000 n 287 0 obj << /Linearized 1 /O 292 /H [ 2846 713 ] /L 773938 /E 80277 /N 9 /T 768079 >> endobj xref 287 105 0000000016 00000 n H�b```f`��c`g`��db@ !6�(Ǿ)3/���|ɲ���s�eH٪=='�U�.� For the main two livestock subgroups, namely, meat and milk, only feed originating from the respective subgroup is removed. Salinity effect on plant growth and yield. In the dry season, precision farmers want to know the actual effect of drought on their crops. 0000009683 00000 n Data on agricultural employment, in particular, should be used with caution. This equation is compared with various other methods for estimating ETo. 0000009777 00000 n 0000009871 00000 n Crop salinity tolerance and yield function. 0000009304 00000 n phase). The Consumer Price Index is an example of a Laspeyres Index. Indices calculated without any deductions for feed and seed are referred to as ''gross". Europe P. i = proportion of ith crop This index is also bounded by the number zero and one. 0000005153 00000 n In the crop coefficient approach the crop evapotranspiration, ET c, is calculated by multiplying the reference crop evapotranspiration, ET o, by a crop coefficient, K c: ET c = K c ET o (56) where To obtain the index, the aggregate for a given year is divided by the average aggregate for the base period 2004-2006. 0000006962 00000 n The "international commodity prices" are used in order to avoid the use of exchange rates for obtaining continental and world aggregates, and also to improve and facilitate international comparative analysis of productivity at the national level. Leaf Area Index (LAI) Williams (1946) proposed the term, Leaf Area Index (LAI). 0000011149 00000 n 0000010949 00000 n 0000009113 00000 n 0000014705 00000 n Calculations of the Moisture Stress Index are based on (1) the extent of severe to catastrophic drought or catastrophic wetness within the crop growing regions, i.e., those climate divisions with a Z Index value less than or equal to -2 or Z Index greater than or equal to +5, and (2) the average annual crop productivity* of each climate division within the crop growing region.

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