Estimating yield of sorghum using root zone water balance model and spectral characteristics of crop in a dryland Alfisol

Autor:	V. Ramesh, M. Vanaja, Y. S. Ramakrishna, G. R. Korwar, U.K. Mandal, U. S. Victor, K. L. Sharma, N.N. Srivastava
Rok vydání:	2007
Předmět:	Hydrology Soil Science Runoff curve number Available water capacity Water balance Evapotranspiration Soil water Environmental science DNS root zone Surface runoff Soil conservation Agronomy and Crop Science Earth-Surface Processes Water Science and Technology
Zdroj:	Agricultural Water Management. 87:315-327
ISSN:	0378-3774
DOI:	10.1016/j.agwat.2006.08.002
Popis:	This study investigated the relationship between sorghum grain yield for a range of soil depths, with the seasonal crop water stress index based on relative evapotranspiration deficits and spectral vegetation indices. A root zone water balance model was used to evaluate seasonal soil water fluctuations and actual evapotranspiration within a toposequence; soil depth varied between 30 and 75 cm and available water capacity ranged from 6.9 to 12.6% (v/v, %). An empirical model was used to determine root growth. Runoff was estimated from rainfall data using the curve number techniques of the Soil Conservation Services, combined with a soil water-accounting procedure. The high r2 values between modeled and observed values of soil water in the root zone (r2 > 0.70, significant at P
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::040bef07fab6d6d981bea463bdfd6271 https://doi.org/10.1016/j.agwat.2006.08.002 Zobrazit plný text záznamu Full Text from ScienceDirect