Estimation of Agricultural Productivity Distribution in India
Investigating correlation between agricultural productivity and NPP
The total amount of the organic substance, produced in the crop land, was estimated by multiplying crop land NPP (as describe in proceeding section) and the area under each grid cell. Moreover, verification was tried by calculating them in each district boundary and their correspondence was made with statistical data of crop production. But, in reality is not possible because, crop land NPP is total amount of all crop types whereas statistical data available are on crop basis. Also, the rates of NPP produced in crop land changed into the crop were different by their types. Therefore, it is inappropriate to calculate the total amount of crop production of all crop types. Hence, districts were classified into respective agriculture areas, they were examined for each agricultural land. Rice, maize, wheat, jowar, bajra were selected as object and as they are the major crops in India. The classification into agricultural area was done by selecting the crop planted as shown in the figure 5 and correlation coefficient of crop land NPP and the amount of crop production is shown in the table 1. But, to get rid of the correlation which occur from the
difference in the area of each district, they production per planted area and crop land NPP per area of crop land were calculated and used for the purpose. The significance of difference crop types can be seen from table 1 and figure 5. Actually, many crops are produced in each district, so the mixture of other crops in each agriculture area are the reason for errors occurred. So taking the factors into consideration while calculation, it can be said that results obtained are significant and has got relevancy. Therefore, this results says that NPP estimated from remote sensing data can be used to estimate or complement crop production to a large extent.
Figure 4. Classification of agriculture area based on planted area
Figure 5: The scatter diagram of crop land NPP and the amount of crop productivity
Table 1. correlation coefficient of crop land NPP and the amount of crop production
| Rice |
R=0.0160 |
| Maize |
R=0.4801* |
| Wheat |
R=0.2748** |
| Jowar |
R=0.5451** |
| Bajra |
R=0.7857 |
**...Significance level 1%
*...Significance level 5% |
