Tomato (Lycopersicon esculentum) is an annual or short lived perennial pubescent herb and greyish green curled uneven pinnate leaves. The flowers are off white bearing fruits which are red or yellow in colour. It is a self pollinated crop.
Tomato can be grown on a wide range of soils from sandy to heavy clay. However, well-drained, sandy or red loam soils rich in organic matter with a pH range of 6.0-7.0 are considered as ideal.
Tomato is a warm season crop. The best fruit colour and quality is obtained at a temperature range of 21-24°C. Temperatures above 32o C adversely affects the fruit set and development. The plants cannot withstand frost and high humidity. It requires a low to medium rainfall. Bright sunshine at the time of fruit set helps to develop dark red coloured fruits. Temperature below 10 oC adversely affects plant tissues thereby slowing down physiological activities.
Nursery Bed Preparation
Tomato seeds are sown on nursery beds to raise seedlings for transplanting in the field. Raised beds of size 3 x 0.6 m and 10-15 cm in height are prepared. About 70 cm distance is kept between two beds to carry out operations of watering, weeding, etc. The surface of beds should be smooth and well levelled. Add sieved FYM and fine sand on the seedbed. Raised beds are necessary to avoid problem of water logging in heavy soils. In sandy soils, however, sowing can be taken up in flat beds. To avoid mortality of seedlings due to damping off, drench the seed bed first with water and then with Bavistin (15-20 g/10 litres of water).
Season of Planting
Seeds are sown in June July for autumn winter crop and for spring summer crop seeds are sown in November. In the hills seed is sown in March April.
Raising of Seedlings
About 250-300 g of seed are sufficient for raising seedlings for one hectare of land. Prior to sowing seeds are treated with fungal culture of Trichoderma viride (4 g/ kg of seed) or Thiram (2g/kg of seed) to avoid damage from damping-off disease. Sowing should be done thinly in lines spaced at 10-15 cm distance. Seeds are sown at a depth of 2-3 cm and covered with a fine layer of soil followed by light watering by water can. The beds should then be covered with dry straw or grass or sugarcane leaves to maintain required temperature and moisture. The watering should be done by water can as per the need till germination is completed. The cover of dry straw or grass is removed immediately after germination is complete. During the last week in nursery, the seedlings may be hardened by slightly withholding water.
The seedlings with 5-6 true leaves are ready for transplanting within 4 of sowing.
The field is ploughed to fine tilth by giving four to five ploughing with a sufficient interval between two ploughing. Planking should be done for proper levelling. Furrows are then opened at the recommended spacing. Well-decomposed FYM (25 t/ha) is thoroughly incorporated at the time of land preparation.
Spacing depends upon the type of variety grown and the season of planting. Normally the seedlings are transplanted at a spacing of 75-90 x 45-60 cm.
Method of Planting
Seedlings are transplanted in furrows in light soils and on side of the ridges in case of heavy soils. A pre-soaking irrigation is given 3-4 days prior to transplanting. Before planting seedlings should be dipped in a solution prepared by Nuvacron (15ml) and Dithane M - 45 (25g) in 10 litres of water for 5-6 minutes. Transplanting should preferably be done in the evening.
The field should be kept weed-free, especially in the initial stage of plant growth, as weeds compete with the crop and reduce the yield drastically. Frequent shallow cultivation should be done at regular interval so as to keep the field free from weeds and to facilitate soil aeration and proper root development. Deep cultivation is injurious because of the damage of roots and exposure of moist soil to the surface. Two-three hoeing and the earthing up are required to keep the crop free of weeds. Pre- emergence application of Basalin (1kg a.i./ha) or Pendimethalin (1kg a.i./ha), coupled with one hand weeding 45 days after transplanting is effective for control of weeds. Plastic mulching (black or transparent) can be used to control the weeds. Weeds can be controlled successfully by mulching plus use of herbicides such as Pendimethalin (0.75 kg a.i./ha) or Oxyfluorfen (0.12 kg a.i./ha).
Tomato should not be grown successively on the same field and a break of at least one year is required between planting of tomatoes or other Solanacesous crops (eg. Chillies, Brinjals, Capsicum, Potato, Tobacco, etc.), cucurbits and many other vegetables. The crops, which can be grown after tomatoes, are as follows- Cereals (eg. Rice, Corn Sorghum, Wheat, Millets, etc.) or Cruciferons crops (eg. Cabbage, Cauliflower, Kohlrabi etc) or Radish, Watermelon, Onion, Garlic, Groundnut, Cotton, Safflower , Sunflower, Sesame, Sugar beet and Marigold.
Tomato is well fitted in different cropping systems of cereals, grains, pulses and oilseeds. Cropping systems rice-tomato, rice-maize, okra-potato-tomato, tomato-onion are popular in various parts of India. Spinach or radish can also be grown as inter-crop in tomato successfully.
Due to the tall habit and heaving bearing nature of the hybrids staking is essential. Staking facilitates intercultural operations and helps in maintaining the quality of the fruits. It is done 2-3 weeks after transplanting. Staking can be done either by wooden stakes or laying overhead wires to which individual plant is tied. In case of indeterminate types, tow or three wires are stretched parallel to each other along the row and plants are tied to these wires.
Tomato is very sensitive to water application. Heavy irrigation provided after a long spell of drought causes cracking of the fruits. Hence it should be avoided. Light irrigation should be given 3-4 days after transplanting. Irrigation intervals should be according to soil type and rainfall, irrigation should be given 7-8 days interval during kharif, during rabi 10-12 days and 5-6 days during summer.
Flowering and fruit development are the critical stages of tomato therefore; water stress should not be given during this period.
The fertilizer dose depends upon the fertility of soil and amount of organic manure applied to the crop. For a good yield, 15-20 tonnes of well-decomposed FYM is incorporated into the soil. Generally, application of 120 kg N, 80 kg P2O5 and 50 kg K2O per hectare is recommended for getting optimum yield. Half dose of N and full dose of P and K is given at the time of planting. The balance half of N is given as top dressing 30 days after transplanting.
For hybrid varieties, the recommended dose per hectare is 180 kg N, 100 kg P2 O5 and 60 kg K2 O. 60 kg N and half of P & K are given at the time of transplanting. Remaining quantities of P & K and 60 kg N is top dressed 30 after transplanting. A third dose of 60 kg N is applied 50 days after transplanting.
Effect of growth regulators in tomato crop is as follows-
|Plant-growth regulators||Concentration (mg/litre)||Method of application||Attributes affected|
|Gibberellic acid (GA)||
Higher yield at low temperature
Flowering, fruiting and yield
||Foliar spray at low flowering
||Tomato fruit set at high temperatures|
The IPM package given below will take care of fruit borer, leaf miner, mite and insect vector.
Depending on the variety, fruits become ready for first picking in about 60-70 days after transplanting. The stage of harvesting depends upon the purpose to which the fruits are to be used. The different stages of harvesting are as follows-
Fruits are normally harvested early in the morning or evening. The fruits are harvested by twisting motion of hand to separate fruits from the stem. Harvested fruits should be kept only in basket or crates and keep it in shade. Since all the fruits do not mature at the same time, they are harvested at an interval of 4 days. Generally there will be 7-11 harvests in a crop life span.
The yield per hectare varies greatly according to variety and season. On an average, the yield varies from 20-25 t/ha. Hybrid varieties may yield upto 50-60 t/ha.
Source : NHB
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