Performance of promising wheat genotypes and sowing time for cultivation under Burma dek (Melia composita L.) based agri-silviculture system in Punjab

The performance of different varieties of wheat (Triticum aestivum L.) was studied in the alleys of Burma dek (Melia composita L.) trees spaced at 7×3m. The treatments included environments viz., open and intercropping with dek, four wheat varieties viz., HD2967, WH1105, PBW677 and PBW 725s own on three different times i.e.25^th October, 10^th November and 25^th November in 2015 under 3 years old block plantation of Burma dek. The experiment was laid out in split-split plot design and data were recorded in three replications for each treatment including tree and tree-less plots. Micro-climatic parameters influencing the understory crop growth and yield like surface air temperature, relative humidity and photos ynthetically active radiation were observed in open and intercropped conditions. There was reduction of 21.4% inaverage wheat yield inter cropped with 3 years old dek block plantation as compared to open. Late sowing of wheat crop drastically reduced the crop growth (plant height, tillers/m² and dry matter) and yield attributes (spike length and number of grains/spike) under dek and open. Wheat sown on 25^th October, reported maximum growth and yield attributes which was statistically at par with 10^th November and significantly higher than 25^th November. The 25^th October sown crop had highest grain yield (4.90 Mg ha⁻¹) which was at par with 10^th November (4.35 Mg ha⁻¹) and significantly better than 25^th November under dek. Amongst wheat varieties, PBW 725 recorded highest grain yield i.e.4.91 Mg ha⁻¹ which was statistically at par with PBW 677(4.67Mgha⁻¹) and significantly better than rest of the varieties. Hence, it may beconcluded that wheat varieties, PBW 725 and PBW 677 are suitable for intercropping with dekblock plantation and these should be sown during 25^th Octoberto 10^th November for higher yield.