Vol. 15 No. 1
Productivity, phenology and heat unit accumulation of wheat (Triticum aestivum L.) as influenced by nitrogen management using green seeker
Author(s): J. KAUR, H. RAM AND S. PAL SINGH
Abstract: The field experiment was conducted during Rabi 2014-15 and 2015-16 at the Punjab Agricultural University, Ludhiana, Punjab to study the effect of nitrogen (N) scheduling using Green Seeker on phenology, heat unit accumulation viz growing degree days (GDD), helio-thermal units (HTU) and photo-thermal unit (PTU) and productivity of wheat. Experiment was laid out in complete randomized block design with 10 treatments [N doses 0, 120, 150 & 180 kg ha-1 and combinations of N60/N84/N120 kg ha -1 + additional N as guided by GreenSeeker at second irrigation and at third irrigation] replicated thrice. The soil of the experimental site was low in organic carbon and nitrogen but medium in available phosphorus and potash. Nitrogen dose of 160/164 kg N ha -1 in three splits [i.e. 60 kg N ha-1 at sowing and 60 kg N ha-1 at first irrigation, and 40/44 kg N ha-1 at second irrigationas guided by Green Seeker] and application of 137/130 kg N ha-1 in three splits [with 42 kg N ha-1 at sowing and 42 kg N ha-1 at first irrigation, and 53/46 kg N ha-1 as guided by Green Seeker] at second irrigation recorded longer phenological stages, higher agrometeorological indices and better wheat yield than application of 120 kg Nha-1 but similar to application 150 kg Nha-1. Application of 126/113 kg N ha-1 [with schedule of 40 kg N ha-1 at sowing and 40 kg N ha-1 at first irrigation, 40 kg N ha-1 at second irrigation and 6/13 kg N ha-1 as guided by Green Seeker] at third irrigation resulted in saving of 9-24 kg N ha-1, longer phenophases, agrometeorological indices, heat use efficiency and higher yield in comparison to 150 kg N ha-1.
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