首页|Rice yield gaps and nitrogen-use efficiency in the Northwestern Indo-Gangetic Plains of India: Evidence based insights from heterogeneous farmers' practices

Rice yield gaps and nitrogen-use efficiency in the Northwestern Indo-Gangetic Plains of India: Evidence based insights from heterogeneous farmers' practices

扫码查看
原文链接
  • NSTL
  • Elsevier
A large database of individual farmer field data (n = 4,107) for rice production in the Northwestern IndoGangetic Plains of India was used to decompose rice yield gaps and to investigate the scope to reduce nitrogen (N) inputs without compromising yields. Stochastic frontier analysis was used to disentangle efficiency and resource yield gaps, whereas data on rice yield potential in the region were retrieved from the Global Yield Gap Atlas to estimate the technology yield gap. Rice yield gaps were small (ca. 2.7 t ha(-1) ,or 20% of potential yield, Yp) and mostly attributed to the technology yield gap (ca. 1.8 t ha(-1), or ca. 15% of Yp). Efficiency and resource yield gaps were negligible (less than 5% of Yp in most districts). Small yield gaps were associated with high input use, particularly irrigation water and N, for which small yield responses were observed. N partial factor productivity (PFP-N) was 45-50 kg grain kg(-1) N for fields with efficient N management and approximately 20% lower for the fields with inefficient N management. Improving PFP-N appears to be best achieved through better matching of N rates to the variety types cultivated and by adjusting the amount of urea applied in the 3rd split in correspondance with the amount of diammonium-phosphate applied earlier in the season. Future studies should assess the potential to reduce irrigation water without compromising rice yield and to broaden the assessment presented here to other indicators and at the cropping systems level.

Big dataStochastic frontier analysisGlobal yield gap atlasFertilizer managementSustainability assessmentPRECISION-CONSERVATION AGRICULTUREFARMING SYSTEMSWATER-USEINORGANIC NITROGENCROPPING SYSTEMFOOD SECURITYCENTRAL LUZONWHEATMAIZESUSTAINABILITY

Nayak, Hari Sankar、Silva, Joao Vasco、Parihar, Chiter Mal、Kakraliya, Suresh K.、Krupnik, Timothy J.、Bijarniya, Deepak、Jat, Mangi Lal、Sharma, Parbodh C.、Jat, Hanuman Sahay、Sidhu, Harminder Singh、Sapkota, Tek B.

展开 >

ICAR Indian Agr Res Inst IARI

Int Maize & Wheat Improvement Ctr CIMMYT

ICAR Cent Soil Salin Res Inst CSSRI

Borlaug Inst South Asia BISA

展开 >

2022

10.1016/j.fcr.2021.108328

Field Crops Research

Field Crops Research

SCI
ISSN：0378-4290
年,卷(期)：2022.275
  • 19
  • 68