NRCL - Research Achievments

Genetic Resource Management and Crop Improvement

  • Fifty two accessions of litchi and allied species were collected from indigenous sources and were planted in the germplasm repository.
  • Eight cultivars of litchi were also collected from Spain under FAO Project
  • The molecular characterization of 20 litchi cultivars is in progress in collaboration with CISH, Lucknow using RAPD and ISSR markers
  • Fifty six superior clones of litchi were identified and propagated for their detailed evaluation.
  • The hybrid progeny involving litchi cvs. Shahi, China, Bedana and Kasba were developed and are under evaluation.
  • About 400 seedlings of cv. Shahi and China are under evaluation. Further, seedlings are also being raised from the selected clones.

Crop Production

  • Plantation of various experimental blocks with most common cvs. Shahi and China has been completed in 15 ha area to conduct different trials. A mother block of 1.5 ha, germplasm block of 3 ha, seedling block of 2 ha has also been planted for conducting different studies at the Centre.
  • Rejuvenation technique for old senile orchard has been standardized
  • Application of 75:50:100 g NPK/plant/year in cv. Shahi and 100:50:100 g NPK/plant/year in cv. China has been found most effective for vegetative growth of plants.
  • Inter-space utilization protocol for young non-bearing litchi orchards has been developed with (1) Litchi-Banana (2) Litchi–Cowpea-Potato-Onion (3) Litchi-Okra-Gladiolus models with high B:C ratio of 2.38, 1.53 and 1.37, respectively.
  • Foliar application of planofix @ 2.5 ml/10 L or NAA 20 mg/ L of water one week after fruit set, significantly checked the fruit drop.
  • Two spray of KNO3 (4% and 2%) after 20 and 30 days of fruit set delayed colour-break by 5 days in litchi cv. Shahi.
  • Bagging of individual litchi bunches in cv.Shahi with perforated butter paper was found the best for production more class-I category fruits with reduced sun-burn and cracked fruits.
  • Covering plants with 30% green and 50% white shade net extended the harvesting period up to 16 days with slight decrease in TSS and acidity.
  • Biodiversity of arbuscular mycorrhiza in litchi rhizosphere was studied. Three species of Glomus was the found predominantly associated.

Crop Protection

  • Major pests of litchi prevalent in the area were identified. Borer complex of litchi are most important as they extensively damage the developing and matured fruits reducing the yields and marketability.
  • Trichogramma @50,000 eggs/ha at flower initiation and Nimbicidine @0.5% at fruiting, Cypermethrin @0.005% and Nimbicidine @0.5% were effective in minimizing the damage caused by fruit borer.
  • Three new threats of pests in litchi were identified viz., red weevil (Apoderus blandus), semilooper (Anisodes illepidaria) and bagworm (Eumeta crameri).