Hello sir
There are two species of marigold, namely, African marigold (Tagetes erecta) and French marigold (Tagetes patula). Inter-specific hybrids between these two species also have been evolved, which are known as Red and Gold hybrids. Varieties under this group are Nugget, Show Boat and Red Seven Star.
Soil
A wide range of soils with good drainage is suitable for cultivation of marigold. Sandy loam soil with pH 5.6 to 6.5 is ideal.
Propagation
Seeds are used for raising the crop.
Cultural practices
Prepare nursery beds of 6 m length, 1.2 m width and 10-20 cm height. Apply 30 kg FYM along with 0.5 kg of 15:15:15 fertilizer mixture and mix them well in the soil. Sow the seeds in rows 7.5 cm apart. Cover the seeds with fine FYM and irrigate. The seedlings will be ready for transplanting within one month.
For the main-field, the land should be ploughed well and FYM @ 20 t ha-1 should be incorporated to the soil. Apply a basal dose of fertilizers @ 112.5 kg N, 60 kg P2O5, and 60 kg K2O per ha. Transplant the seedlings at a spacing of 30 cm x 30 cm in case of French marigold and 45 cm x 45 cm in case of African marigold on one side of the ridge and irrigate. Topdress the crop with 112.5 kg N per ha at the time of pinching (30-45 days after transplanting) and earth up. Pinching is done to increase the total yield. It consists of removing terminal portion of the plant 30-45 days after transplanting.
Irrigate once in 4-6 days depending upon soil moisture and weather conditions. Weeds have to be removed at monthly intervals.
Plant protection
Marigold is not attacked by many pests. However, flower beetles, leaf hoppers, stalk borers, mites etc. cause occasional problems. These plants are rarely attacked by diseases. In poorly drained soils, foot rot caused by Phytophthora may occur. Stem rot caused by Sclerotinia sclerotiorum is also reported. Soil drenching with copper oxychloride is helpful in checking foot rot, while stem rot is controlled by drenching with fungicides.
Harvest and yield
Marigold flowers will be ready for harvest in about 21/2 months time from the date of transplanting. The plant continues to bear flowers for another 2-21/2 months. The flowers are harvested when they have attained full size. Harvest the flowers in the evening along with a portion of stalk. Yield of French marigold will be 8-12 t ha-1 and that of African marigold 11-18 t ha-1.