Ajibola, A. T. and Kolawole, G. O. (2019). Nutrient management in maize-sesame intercropping system. Res. Crop. 20: 495-500.
Bishnu, P. K. (2020). SPAD value varies with age and leaf of maize plant and its relationship with grain yield. BMC Res. Notes 13: doi: 10.1186/s13104-020-05324-7.
Brown, L. A., Williams, O. and Dash, J. (2022). Calibration and characterisation of four chlorophyll meters and transmittance spectroscopy for non-destructive estimation of forest leaf chlorophyll concentration. Agric. Forest Meteorol. 323: doi.org/10.1016/j.agrformet. 2022.109059.
Chaurasia, N. K., Nirala, R. B. P., Singh, B. and Mandal, S. S. (2020). Trait association and path coefficient analysis in maize (Zea mays L.) for grain yield and its attributes. J. Pharmacog. Phytochem. 9: 527-31.
Cochran, W. G. and Cox, G. M. (1977). Experimental Design; Asia Publishing House: Calcutta, India. pp. 142-81.
Edalat, M., Naderi, R. and Egan, T. P. (2019). Corn nitrogen management using NDVI and SPAD sensor-based data under conventional vs. reduced tillage systems. J. Plant Nutri. 42: 2310-22.
Ghosh, D., Brahmachari, K., Brestic, M., Ondrisik, P., Hossain, A., Skalicky, M., Sarkar, S., Moulick, D., Dinda, N. K., Das, A., Pramanick, B., Maitra, S. and Bell, R. W. (2020). Integrated weed and nutrient management improve yield, nutrient uptake and economics of maize in the rice-maize cropping system of Eastern India. Agronomy 10: doi.org/10.3390/ agronomy10121906.
Immanuel, R. Rex, Mullaivendhan, V., Thiruppathi, M. and Sudhagar Rao, G. B. (2020). Influence of nutrient management practices for relay cropped maize (Zea mays). Crop Res. 55: 208-14.
Jat, R. D., Jat, H. S., Nawaz, R. K., Yadav, A. K., Bana, A., Choudhary, K. M. and Jat, M. L. (2018). Conservation agriculture and precision nutrient management practices in maize-wheat system: Effects on crop and water productivity and economic profitability. Field Crops Res. 222: 111-20.
Joshi, N., Chandrashekara, C. P. and Potdar, M. P. (2020). Influence of precision nutrient management on yield and yield components and dry matter partitioning in maize hybrids. J. Pharmacog. Phytochem. 9: 1270-77.
Jyothsna, K., Padmaja, J., Sreelatha, D., Kumar, R. M. and Madhavi, A. (2021). Study on nutrient management of hybrid maize (Zea mays L) through decision support tools. J. Pharmacog. Phytochem.10: 760-64.
Kumar, D., Patel, R. A., Ramani, V. P. and Rathod, S. V. (2021). Evaluating precision nitrogen management practices in terms of yield, nitrogen use efficiency and nitrogen loss reduction in maize crop under Indian conditions. Int. J. Plant Prod. 15: 243-60.
Ladha, J. K., Pathak, H., Krupnik, T. J., Six, J. and van Kessel, C. (2005). Efficiency of fertilizer nitrogen in cereal production: Retrospect’s and prospects. Adv. Agron. 87: 85-156.
Nduwimana, D., Mochoge, B., Danga, B., Masso, C., Maitra, S. and Gitari, H. I. (2020). Optimizing nitrogen use efficiency and maize yield under varying fertilizer rates in Kenya. Int. J. Bioresource Sci. 7: 63-73.
OECD/FAO (2019). Agricultural Outlook. Paris: OECD Agriculture Statistics.)
Padilla, F. M., de Souza, R., Peña-Fleitas, M. T., Grasso, R., Gallardo, M. and Thompson, R. B. (2019). Influence of time of day on measurement with chlorophyll meters and canopy reflectance sensors of different crop N status. Precision Agric. 20: 1087-1106.
Pooniya, V., Jat, S. L., Choudhary, A. K., Singh, A. K., Parihar, C. M., Bana, R. S., Swarnalakshmi, K. and Rana, K. S. (2015). Nutrient Expert assisted site-specific-nutrient-management: An alternative precision fertilization technology for maize-wheat cropping system in South-Asian Indo-Gangetic Plains. Indian J. Agric. Sci. 85: 996-1002.
Porra R. J.; Thompson W. A. and Kreidemann P. E. (1989). Determination of accurate extinction coefficients and simultaneous equations for assaying chlorophylls a and b extracted with four different solvents: verification of the concentration of chlorophyll standards by atomic absorption spectrometry. Biochimica et Biophysica Acta 975: 384-94.
Prakasha, G. (2018). Influence of precision nitrogen management through crop sensors on growth and yield of maize (Zea mays L.). Mysore J. Agric. Sci. 52: 285-92.
Prakasha, G., Somashekar, K. S. and Goudra, S. (2020). A novel approach for increasing productivity under precision nitrogen management in maize (Zea mays L.) through crop sensors. J. Pharmacog. Phytochem. 9: 97-103.
Pramanick, B., Kumar, M., Naik, B. M., Kumar, M., Singh, S. K., Maitra, S. and Minkina, T. (2022). Long-term conservation tillage and precision nutrient management in maize–wheat cropping system: Effect on soil properties, crop production and economics. Agronomy 12: doi:10.3390/agronomy12112766.
Ram, M. S., Shankar, T., Maitra, S. and Duvvada, S. K. (2020). Effect of integrated nutrient management on growth, yield, nutrient content and economics of summer rice (Oryza sativa L.). Indian J. Pure Appl. Biosci. 8: 421-27.
Sairam, M., Maitra, S., Sain, S., Gaikwad, D. J. and Sagar, L. (2023a). Dry matter accumulation and physiological growth parameters of maize as influenced by different nutrient management practices. Agric. Sci. Digest. 2023: doi: 10.18805/ag.D-5835.
Sairam, M., Maitra, S., Vishnupriya, K. K., Sahoo, U., Sagar, L. and Krishna, T. G. (2023b). Hand-held optical sensors for optimizing nitrogen application and improving nutrient use efficiency. Int. J. Bioresource Sci. 10: 09-18.
Satyanarayana, T., Majumdar, K., Pampolino, M., Johnston, A. M., Jat, M. L., Kuchanur, P., Sreelatha, D., Sekhar, J. C., Kumar, Y., Maheswaran, R. and Karthikeyan, R. (2013). Nutrient ExpertTM: A tool to optimize nutrient use and improve productivity of maize. Better Crops-South Asia 97: 21-24.
Schlemmer, M., Gitelson, A., Schepers, J., Ferguson, R., Peng, Y., Shanahan, J. and Rundquist, D. (2013). Remote estimation of nitrogen and chlorophyll contents in maize at leaf and canopy levels. Int. J. Appl. Earth Observ. Geoinform. 25: 47-54.
Sharma, L. K. and Bali, S. K. (2018). A review of methods to improve nitrogen use efficiency in agriculture. Sustainability 10: doi.org/10.3390/su10010051.
Shyam, C. S., Rathore, S. S., Shekhawat, K., Singh, R. K. and Singh, V. K. (2019). Growth and productivity of maize (Zea mays L.) under precision nutrient management. Ann. Agric. Res. 40: 1-7
Singh, B. and Ali, A. M. (2020). Using hand-held chlorophyll meters and canopy reflectance sensors for fertilizer nitrogen management in cereals in small farms in developing countries. Sensors 20: doi.org/10.3390/s20041127.
Singh, H., Halder, N., Singh, B., Singh, J., Sharma, S. and Shacham-Diamand, Y. (2023). Smart farming revolution: portable and real-time soil nitrogen and phosphorus monitoring for sustainable agriculture. Sensors. 23: doi.org/10.3390/s23135914.
Singh, J. and Singh, V. (2022). Chlorophyll meter-based precision nitrogen management in spring maize. J. Plant Nutri. 46: 17-27.
Singh, V., Pant, A. K., Bahtnagar, A. and Bhatt, M. (2017). Evaluation of nutrient expert-based fertilizer recommendation for growth, yield and nutrient uptake of maize hybrids and soil properties in maize-wheat cropping system in mollisol. Int. J. Curr. Microbiol. Appl. Sci. 6: 3539-50.
Zhang, R., Yang, P., Liu, S., Wang, C. and Liu, J. (2022). Evaluation of the methods for estimating leaf chlorophyll content with SPAD Chlorophyll Meters. Remote Sensing 14: doi.org/10.3390/rs14205144.
Bishnu, P. K. (2020). SPAD value varies with age and leaf of maize plant and its relationship with grain yield. BMC Res. Notes 13: doi: 10.1186/s13104-020-05324-7.
Brown, L. A., Williams, O. and Dash, J. (2022). Calibration and characterisation of four chlorophyll meters and transmittance spectroscopy for non-destructive estimation of forest leaf chlorophyll concentration. Agric. Forest Meteorol. 323: doi.org/10.1016/j.agrformet. 2022.109059.
Chaurasia, N. K., Nirala, R. B. P., Singh, B. and Mandal, S. S. (2020). Trait association and path coefficient analysis in maize (Zea mays L.) for grain yield and its attributes. J. Pharmacog. Phytochem. 9: 527-31.
Cochran, W. G. and Cox, G. M. (1977). Experimental Design; Asia Publishing House: Calcutta, India. pp. 142-81.
Edalat, M., Naderi, R. and Egan, T. P. (2019). Corn nitrogen management using NDVI and SPAD sensor-based data under conventional vs. reduced tillage systems. J. Plant Nutri. 42: 2310-22.
Ghosh, D., Brahmachari, K., Brestic, M., Ondrisik, P., Hossain, A., Skalicky, M., Sarkar, S., Moulick, D., Dinda, N. K., Das, A., Pramanick, B., Maitra, S. and Bell, R. W. (2020). Integrated weed and nutrient management improve yield, nutrient uptake and economics of maize in the rice-maize cropping system of Eastern India. Agronomy 10: doi.org/10.3390/ agronomy10121906.
Immanuel, R. Rex, Mullaivendhan, V., Thiruppathi, M. and Sudhagar Rao, G. B. (2020). Influence of nutrient management practices for relay cropped maize (Zea mays). Crop Res. 55: 208-14.
Jat, R. D., Jat, H. S., Nawaz, R. K., Yadav, A. K., Bana, A., Choudhary, K. M. and Jat, M. L. (2018). Conservation agriculture and precision nutrient management practices in maize-wheat system: Effects on crop and water productivity and economic profitability. Field Crops Res. 222: 111-20.
Joshi, N., Chandrashekara, C. P. and Potdar, M. P. (2020). Influence of precision nutrient management on yield and yield components and dry matter partitioning in maize hybrids. J. Pharmacog. Phytochem. 9: 1270-77.
Jyothsna, K., Padmaja, J., Sreelatha, D., Kumar, R. M. and Madhavi, A. (2021). Study on nutrient management of hybrid maize (Zea mays L) through decision support tools. J. Pharmacog. Phytochem.10: 760-64.
Kumar, D., Patel, R. A., Ramani, V. P. and Rathod, S. V. (2021). Evaluating precision nitrogen management practices in terms of yield, nitrogen use efficiency and nitrogen loss reduction in maize crop under Indian conditions. Int. J. Plant Prod. 15: 243-60.
Ladha, J. K., Pathak, H., Krupnik, T. J., Six, J. and van Kessel, C. (2005). Efficiency of fertilizer nitrogen in cereal production: Retrospect’s and prospects. Adv. Agron. 87: 85-156.
Nduwimana, D., Mochoge, B., Danga, B., Masso, C., Maitra, S. and Gitari, H. I. (2020). Optimizing nitrogen use efficiency and maize yield under varying fertilizer rates in Kenya. Int. J. Bioresource Sci. 7: 63-73.
OECD/FAO (2019). Agricultural Outlook. Paris: OECD Agriculture Statistics.)
Padilla, F. M., de Souza, R., Peña-Fleitas, M. T., Grasso, R., Gallardo, M. and Thompson, R. B. (2019). Influence of time of day on measurement with chlorophyll meters and canopy reflectance sensors of different crop N status. Precision Agric. 20: 1087-1106.
Pooniya, V., Jat, S. L., Choudhary, A. K., Singh, A. K., Parihar, C. M., Bana, R. S., Swarnalakshmi, K. and Rana, K. S. (2015). Nutrient Expert assisted site-specific-nutrient-management: An alternative precision fertilization technology for maize-wheat cropping system in South-Asian Indo-Gangetic Plains. Indian J. Agric. Sci. 85: 996-1002.
Porra R. J.; Thompson W. A. and Kreidemann P. E. (1989). Determination of accurate extinction coefficients and simultaneous equations for assaying chlorophylls a and b extracted with four different solvents: verification of the concentration of chlorophyll standards by atomic absorption spectrometry. Biochimica et Biophysica Acta 975: 384-94.
Prakasha, G. (2018). Influence of precision nitrogen management through crop sensors on growth and yield of maize (Zea mays L.). Mysore J. Agric. Sci. 52: 285-92.
Prakasha, G., Somashekar, K. S. and Goudra, S. (2020). A novel approach for increasing productivity under precision nitrogen management in maize (Zea mays L.) through crop sensors. J. Pharmacog. Phytochem. 9: 97-103.
Pramanick, B., Kumar, M., Naik, B. M., Kumar, M., Singh, S. K., Maitra, S. and Minkina, T. (2022). Long-term conservation tillage and precision nutrient management in maize–wheat cropping system: Effect on soil properties, crop production and economics. Agronomy 12: doi:10.3390/agronomy12112766.
Ram, M. S., Shankar, T., Maitra, S. and Duvvada, S. K. (2020). Effect of integrated nutrient management on growth, yield, nutrient content and economics of summer rice (Oryza sativa L.). Indian J. Pure Appl. Biosci. 8: 421-27.
Sairam, M., Maitra, S., Sain, S., Gaikwad, D. J. and Sagar, L. (2023a). Dry matter accumulation and physiological growth parameters of maize as influenced by different nutrient management practices. Agric. Sci. Digest. 2023: doi: 10.18805/ag.D-5835.
Sairam, M., Maitra, S., Vishnupriya, K. K., Sahoo, U., Sagar, L. and Krishna, T. G. (2023b). Hand-held optical sensors for optimizing nitrogen application and improving nutrient use efficiency. Int. J. Bioresource Sci. 10: 09-18.
Satyanarayana, T., Majumdar, K., Pampolino, M., Johnston, A. M., Jat, M. L., Kuchanur, P., Sreelatha, D., Sekhar, J. C., Kumar, Y., Maheswaran, R. and Karthikeyan, R. (2013). Nutrient ExpertTM: A tool to optimize nutrient use and improve productivity of maize. Better Crops-South Asia 97: 21-24.
Schlemmer, M., Gitelson, A., Schepers, J., Ferguson, R., Peng, Y., Shanahan, J. and Rundquist, D. (2013). Remote estimation of nitrogen and chlorophyll contents in maize at leaf and canopy levels. Int. J. Appl. Earth Observ. Geoinform. 25: 47-54.
Sharma, L. K. and Bali, S. K. (2018). A review of methods to improve nitrogen use efficiency in agriculture. Sustainability 10: doi.org/10.3390/su10010051.
Shyam, C. S., Rathore, S. S., Shekhawat, K., Singh, R. K. and Singh, V. K. (2019). Growth and productivity of maize (Zea mays L.) under precision nutrient management. Ann. Agric. Res. 40: 1-7
Singh, B. and Ali, A. M. (2020). Using hand-held chlorophyll meters and canopy reflectance sensors for fertilizer nitrogen management in cereals in small farms in developing countries. Sensors 20: doi.org/10.3390/s20041127.
Singh, H., Halder, N., Singh, B., Singh, J., Sharma, S. and Shacham-Diamand, Y. (2023). Smart farming revolution: portable and real-time soil nitrogen and phosphorus monitoring for sustainable agriculture. Sensors. 23: doi.org/10.3390/s23135914.
Singh, J. and Singh, V. (2022). Chlorophyll meter-based precision nitrogen management in spring maize. J. Plant Nutri. 46: 17-27.
Singh, V., Pant, A. K., Bahtnagar, A. and Bhatt, M. (2017). Evaluation of nutrient expert-based fertilizer recommendation for growth, yield and nutrient uptake of maize hybrids and soil properties in maize-wheat cropping system in mollisol. Int. J. Curr. Microbiol. Appl. Sci. 6: 3539-50.
Zhang, R., Yang, P., Liu, S., Wang, C. and Liu, J. (2022). Evaluation of the methods for estimating leaf chlorophyll content with SPAD Chlorophyll Meters. Remote Sensing 14: doi.org/10.3390/rs14205144.
