Real-Time Nitrogen Application of Rice Varieties Based on Leaf Colour Chart under System of Rice Intensification in Temperate Climate
Tauseef Ahmad Bhat,
Raihana Habib Kanth,
Bisma Jan,
Aijaz Nazir,
Shafat Ahmad Ahanger,
Mohammad Salim Mir,
Nasir Bashir Naikoo,
Suhail Fayaz,
Khursheed Ahmad Dar,
Audil Gul,
Tajamul Mansoor,
Ibrahim Al-Ashkar,
Arpna Kumari,
Muhammad Habib ur Rahman,
Ayman El Sabagh
Affiliations
Tauseef Ahmad Bhat
Division of Agronomy, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Raihana Habib Kanth
Division of Agronomy, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Bisma Jan
Division of Agronomy, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Aijaz Nazir
Agromet Unit, Faculty of Horticulture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar, Srinagar 190025, India
Shafat Ahmad Ahanger
Division of Plant Pathology, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Mohammad Salim Mir
Division of Agronomy, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Nasir Bashir Naikoo
Division of Soil Science, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Suhail Fayaz
School of Agriculture, Lovely Professional University, Ludhiana 144411, India
Khursheed Ahmad Dar
Division of Agronomy, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Audil Gul
Division of Genetics and Plant Breeding, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Tajamul Mansoor
Division of Soil Science, Faculty of Agriculture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, Sopore 193201, India
Ibrahim Al-Ashkar
Department of Plant Production, College of Food and Agriculture, King Saud University, Riyadh 11451, Saudi Arabia
Arpna Kumari
Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don 344090, Russia
Muhammad Habib ur Rahman
Crop Science, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, 53115 Bonn, Germany
Ayman El Sabagh
Department of Agronomy, Faculty of Agriculture, Kafrelsheikh University, Kafrelshaikh 33156, Egypt
Increasing nitrogen use efficiency in rice intensification (SRI) is pivotal to achieving high crop yield and reducing nitrogen losses. To find the critical value of the leaf color chart (LCC) for real-time nitrogen (N) application in rice varieties under SRI, a field experiment was laid at the Research Farm, Faculty of Agriculture, Wadura, SKAUST-Kashmir in Kharif between 2019 and 2020. The experiment comprised two cultivars (SR-3 and SR-4) and eight LCC-based nitrogen managements (control, recommended dose of nitrogen (RDF), and three LCC scores (≤3, ≤4, ≤5 each with 20 and 30 kg N ha−1). SR-4 produced significantly higher values for growth and yield parameters, producing higher grain yield (7.02 and 6.86 t ha−1) compared to SR-3 (6.49 and 6.36 t ha−1) between 2019 and 2020, respectively. An LCC value of 5 with 30 kg N ha−1 produced maximum grain yield (7.84 and 7.70 t ha−1) in 2019 and 2020, respectively, which were statistically at par with the LCC value of 5 with 20 kg Nha−1. Pooled data revealed that the highest B: C ratio of 1.55 was recorded in cultivar SR-4 with an LCC value of 5 with 30 kg N ha−1. Furthermore, agronomic and recovery efficiency of nitrogen remained maximum in LCC 5 with 20 kg N ha−1 for both years. Grain yield recorded in LCC 3 20 kg N ha−1 was similar to recommended nitrogen. The present study highlighted the need-based N application through LCC and proved effective in increasing the N-use efficiency and yield in rice.
