Rice Productivity, Zn Biofortification, and Nutrient-Use Efficiency as Influenced by Zn Fertilization Under Conventional Transplanted Rice and the System of Rice Intensification

Frontiers in Environmental Science

G. A. Rajanna¹  M. N. Harish²  Anil Kumar³  Vishal Tyagi⁴  Pankaj Sood⁵  Shakuntla Rahi⁵  D. S. Yadav⁵  O. C. Thakur⁵  Y. V. Singh⁶  Anchal Dass⁷  T. Varatharajan⁷  R. S. Bana⁷  Vijay Pooniya⁷  Shivadhar⁷  Anil K. Choudhary⁸  V. K. Dua⁸  Sushil Kumar⁸  Ingudam Bhupenchandra⁹  Adarsh Kumar^1,10  Mahendra Vikram Singh Rajawat^1,10  Seema Sepat^1,11  S. Vijayakumar^1,12  K. R. Siranta^1,13 

[1] 0ICAR–Directorate of Groundnut Research, Regional Station, Rekalakunta, Ananthapur, India;1ICAR–Indian Horticultural Research Institute, Farm Science Centre, Gonikoppal, India;2GAD Veterinary and Animal Sciences University, Farm Science Centre, Tarn Taran, India;3ICAR-Indian Institute of Seed Sciences, Mau, India;CSK Himachal Pradesh Agricultural University, Farm Science Centre, Sundernagar, India;Centre for Conservation and Utilization of Blue-Green Algae (CCUBGA), ICAR-Indian Agricultural Research Institute, New Delhi, India;Division of Agronomy, ICAR-Indian Agricultural Research Institute, New Delhi, India;Division of Crop Production, ICAR-Central Potato Research Institute, Shimla, India;ICAR-KVK, Tamenglong, ICAR Research Complex for NEH Region, Manipur Centre, Imphal, India;ICAR-National Bureau of Agriculturally Important Microorganisms, Mau, India;ICAR–Indian Institute of Maize Research, Ludhiana, India;ICAR–Indian Institute of Rice Research, Hyderabad, India;Samaj Kalyan Avam Vikas Mandal, Karsog, India;

关键词: conventionally transplanted rice;    Zn-use efficiency;    Zn biofortification;    system of rice intensification;    nutrient management;    rice productivity;   

DOI  :  10.3389/fenvs.2022.869194

来源: DOAJ

【 摘 要 】

The northwestern Himalayas (NWH) in India have low rice productivity (∼2 t ha−1) and quality due to poor crop and nutrient management in predominantly Zn-deficient soils. Hence, a field experimentation in the NWH compared the conventionally transplanted rice (CTR) and the system of rice intensification (SRI) under three nutrient management practices (NMPs), viz., 1) farmers’ fertilization practice, FYM @ 5 t ha−1 + N:P2O5:K2O @ 50:40:20 kg ha−1 (FFP); 2) recommended dose of fertilization, FYM @ 10 t ha−1 + N:P2O5:K2O @ 90:40:40 kg ha−1 (RDF); and 3) RDF + Zn fertilization using ZnSO4 @ 25 kg ha−1 (RDF + Zn). The results revealed that SRI practice harnessed a significantly higher rice yield under different NMPs (6.59–8.69 t ha−1) with ∼1.3–1.4- and ∼3.3–4.3-fold enhancements over the CTR and average rice productivity in NWH, respectively. SRI had the greatest improvement in panicle number hill−1 by ∼2.4 folds over the CTR. RDF + Zn had a significantly higher grain (10.7; 7.9%) and straw yield (28.9; 19.7%) over FFP and RDF, respectively, with significant augmentation of Zn biofortification in grains (11.8%) and Zn uptake (23.9%) over the RDF. SRI also enhanced the Zn concentrations in rice grains and straws by ∼4.0 and 2.7% over CTR with respective increases of 36.9 and 25.9% in Zn uptake. The nutrient harvest index and partial factor productivity of applied nutrients (NPK) had a higher magnitude under SRI and RDF + Zn over their respective counterparts, i.e., CTR and RDF. In addition, SRI had higher AE-Zn, CRE-Zn, and PE-Zn to the tune of 119.6, 63.4, and 34%, respectively, over the CTR. Overall, SRI coupled with RDF + Zn in hybrid rice assumes greater significance in enhancing the rice productivity with better Zn-biofortified grains besides higher nutrient use efficiencies to combat widespread malnutrition and acute Zn deficiencies in humans and livestock in the northwestern Himalayas.

【 授权许可】

Unknown