|
|
|
Overview |
Crop Production |
Crop Pattern |
Crop Yield |
Irrigation |
Soil Management | Precision Farming |
Relevant Products |
Relevant Links
IT potential in agriculture - A GIS implementation in evaluating cardamom potential in Sikkim Himalayas
Saurabh Gupta, Syed Taha Owais
Abstract
It is believed that ancient Indian merchants conquered the world with their large varieties of species. One of the major spices is cardamom. It has been a part of Indian food for time immemorial. Cardamom is an important cash crop. Cardamom production in the country during the recent years has fallen to about 25-30 per cent. Though the production in the country has increased in last 30 years there has been no major breakthrough in its productivity. Besides this, in order to boost its cultivation, import has been banned, but there are instances of illegal import into this country in order to meet the domestic requirements (refer to Financial Times, Oct. 1998). Thus it is very essential to properly investigate into the causes and factors, which led to loss of our past glory in this field. Implementation of IT can be a boon in analyzing and generating models in various fields of agriculture. This paper presents a case study of GIS implementation in finding large cardamom cultivation potential model in Sikkim Himalayas. To make a sample of our study we have selected a watershed named RateChhu situated between East and North districts.
Introduction
Large Cardamom is grown in forest loamy soils having soil depth a few inches to several feet. Colour of large cardamom dry soil ranges from brownish yellow to dark brown; most of the soil colour varies from dark yellowish brown to very dark grayish brown. Texture varies from sandy, sandy loam, silty loam and clay. In general Large Cardamom soil is acidic and majority of soils have pH ranges from 5.0 to 5.5 and more than 1% organic carbon (Biswas et al 1986). On an average, these soils have high in available Nitrogen and medium in available Phosphorous and Potassium. Because of steepness of the terrain, chance of water logging is less, however water logged conditions are not suitable for the plants and adequate drainage is quite essential for better stand of the crop.
In general cardamom is cultivated on hill slopes. It is also seen that the crop is cultivated in terrace land (earlier under paddy cultivation), after raising shade trees. In case of land under gentle slope, large cardamom can be planted on the slopes and in case of medium and steep slopes, the slopes are cut into terraces and then cardamom is planted. Large cardamom is a shade-loving crop. It is seen to grow under dense shade (60-70% of full day light interception) to light shade (26% full day light interception) condition. The day light intensity required for optimum growth of cardamom is 5000-20000 lux. Therefore in virgin forest it is necessary to clean the under growth, over head shade regulation is essential in such a way that at least 50 percent shade is maintained in the area. In case of a bare field having irrigation facility or an area having scarcity of shade trees, planting shade tree saplings of species commonly found in a particular area and suitable for cardamom cultivation may be done in June-July (Table showing suitable shade tree species). The most common shade trees are Utis (Alnus nepalensis), (600-2000 m above mean sea level), Chilaune (Schima wallichi), (550-1515m amsl), Panisaj (Terminalia myriocarpa), (400-1000m amsl), Malato Macaranga denticulata, (67001515m amsl), Asarey (Colebrookianum), (850-2000m amsl), Gogun (Saurauvia nepalensis), (1400-2000m amsl), Bilaune (Maesa chesia), 670-15615m amsl). Planting more than one species of shade tree commonly grown in a particular locality is encouraged. In case of bare land, Utis is of first choice, with other species, depending on the altitude of the area, because of its fast growing nature and is an actinorhizal tree capable of fixing atmospheric nitrogen and it has faster rates of nutrient cycling (Sharma 1984). Planting of shade tree sapling (Utis) at a row distance of 5m in a row and row to row distance of 10m is beneficial. While planting the trees the course and direction of the sun movement and the slope of the hill are generally considered. Usually the tree rows are run along the south-west direction inside the plantation (Karibassavapa 1997).
Major Varieties of Cardamom
There are mainly five varieties of large cardamom; Ramsey, Swaney, Golsey, Varlangey(Bharlangey) and Bebo. Other sub-varieties are Ramnag, Madhusey, Ramla, Mongney etc. are cultivated in small areas.
Ramsey: This name is derived from two Bhtia words - 'Ram' meaning mother and 'Sey' meaning Gold (yellow). This variety is well suited for higher altitude above 5500 on steep slopes.
Golsey: This name is derived from Hindi and Bhutia word 'Gol' meaning round and 'Sey' meaning Gold. They are generally cultivated in lower altitudes; below 4500 ft, especially in Dzongu area in North Sikkim. These are tolerant to common diseases like Chirke and Foorkey.
Varlangey: Cultivated in low, medium, high altitude areas of South regu (East Sikkim). Its yields are exceptionally high at higher altitudes. But these are susceptible to Foorkey and Chirkey.
Seed propagation, rhizomes (sucker multiplication) and tissue culture can do plant Propagation of cardamom.
Thus from above discussion we can conclude that cardamom is altitude friendly with certain aspect and soil requirement, which makes it ideal in its cultivation in this Himalayan mystic state of Sikkim. We have made an attempt to determine the cardamom cultivation potential at micro watershed level, RateChhu watershed.
Description Of Study Area
Sikkim is situated between 27004’ N to 28007’N latitude and 88001’ E and 88055’ E londitude. The state is almost rectangular in shape and covers an area of 7096 sq. kms. Nepal bound state in west by vast stretches of Tibetan plateau in the north, in east by Bhutan and Chumbi valley of Tibet and Darjeeling district of West Bengal stretches along its southern boundary. Administratively state has been divided into four districts namely East, West, North and South and the districts have been further divided into nine sub-divisions.
The sample study has been made on RateChhu watershed, which is located in Gangtok subdivision and Mangan subdivision under East and North districts respectively in the Himalayan State of Sikkim.
Location and Extent of Study Area
|
Name of study area |
RateChhu Watershed |
|
Toposheet source |
78/11, 78/15 |
|
Geographical Location |
27°
20’30’’ and 27°
30’30" North
88°
33’57" and 88°
45’50" East
|
|
Total Area Covered |
87.34 sq. km. (Spans calculated) |
|
Spatial Information |
Watershed map, contour map, forest density map (1988), land use map (1963), roads, settlement, river and drains and soil maps and streams maps. |
|
|
|