PHENOPHASE (BBCH SCALE) BASED NITROGEN AND ZINC SCHEDULING FOR YIELD AND ZINC BIOFORTICATION IN DIRECT SEEDED RICE (Oryza sativa L.)
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Date
2016
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Institute of Agricultural Sciences, Banaras Hindu University, Varanasi
Abstract
The present investigation entitled “phenophase (BBCH scale) based nitrogen and zinc scheduling for yield and zinc biofortication in direct seeded rice” was conducted at the Agricultural Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India during kharif (rainy) season of 2015 with a view to test the performance of nitrogen and zinc fertilization on growth, yield and zinc content of rice under eastern Uttar Pradesh condition to suggest better management of nitrogen and zinc fertilizer.The factorial experiment was laid out in randomized complete block design (factorial) with three levels of nitrogen viz. 0 kg N ha-1 (control), 120 kg N ha-1 [50% at sowing +25% at G 21 (1 tiller detected) +25% at G 32 (panicle formation; panicle 1-2 mm long)], 160 kg N ha-1 [50% at sowing +25% at G 21 (1 tiller detected) +25% at G 32 ( panicle formation; panicle 1-2 mm long)] and five types of zinc management i.e. control (Z0), 5 kg Zn/ha at basal + 0.3 % ZnSO4 spray at G 45 (late booting ) + 0.3% ZnSO4 spray at G 61 (anthesis; anther visible at top of panicle), 10 kg Zn/ha at basal + 0.3% ZnSO4 spray at G 45 (late booting) + 0.3% ZnSO4 spray at G 61 (anthesis; anther visible at top of panicle), 5 kg Zn/ha at basal +0.3% ZnSO4 spray at G 51 ( tip of inflorescence emerged)+ 0.3% ZnSO4 spray at G 73 (early milk), 10 kg Zn/ha at basal +0.3% ZnSO4 spray at G 51 ( tip of inflorescence emerged)+0.3% ZnSO4 spray at G 73 (early milk) and replicated thrice. Recommended dose of P2O5-K2O (60-40 kg ha-1) was applied. The rice variety HUR 3022 was sown in puddled soil with row to row spacing of about 20 cm. On the basis of one year field experimentation it may be concluded that independent application of 160 kg N/ha and 10 kg Zn/ha at basal + 0.3% ZnSO4 spray at G 45 (late booting) + 0.3% ZnSO4 spray at G 61 (anthesis; anther visible at top of panicle) is recommended as these treatments fetched significantly higher grain yield, net returns and B:C ratio from direct seeded rice. However, application of 160 kg N/ha and 10 kg Zn/ha at basal +0.3% ZnSO4 spray at G 51 (tip of inflorescence emerged) + 0.3% ZnSO4 spray at G 73 (early milk) of crop recorded maximum zinc content. There was significant interaction effect of nitrogen and zinc for higher grain yield with N2Z2 [160 kg N/ha and 10 kg Zn/ha at basal + 0.3% ZnSO4 spray at G 45 (late booting) + 0.3% ZnSO4 spray at G 61 (anthesis; anther visible at top of panicle)] and for nitrogen and zinc content in grain N2Z4 [(160 kg N/ha and 10 kg Zn/ha at basal +0.3% ZnSO4 spray at G 51 ( tip of inflorescence emerged)+ 0.3% ZnSO4 spray at G 73 (early milk)].
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Kumar, S. 2016. Phenophase (BBCH scale) based nitrogen and zinc scheduling for yield and zinc biofortication in direct seeded rice (Oryza sativa L.). M. Sc. (Ag.) Thesis, Department of Agronomy, Institute of Agricultural Sciences, BHU, Varanasi.