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Extra resources for The Role of Water in Agriculture. Based on Papers and Discussions at a Symposium Held at the Welsh Plant Breeding Station Near Aberystwyth on March 19th, 1969

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R e s . 3391-3413 Topping, J. , (1962) " E r r o r s of observation and t h e i r t r e a t m e n t " , Inst. of P h y s i c s and P h y s i c a l Soc. Monographs for s t u d e n t s , 3rd Ed. 23 CHAPTER III Evapotranspiration and the water balance in a small clay catchment by R. K. PEGG In October 1965, the Department of Geography at the University of Hull e s t a b l i s h e d a s m a l l catchment e x p e r i m e n t in E a s t Y o r k s h i r e . 53 s q . k m s . ) and is situated about 10 m i l e s (16.

367-368) 10 CHAPTER II Sources of error in Agricultural water budgets by K. A. EDWARDS 1. Introduction Calculating i r r i g a t i o n - n e e d from climatic data involves the drawing up of a water b a l a n c e , or budget, in which m e a s u r e d or e s t i m a t e d gains and l o s s e s of water to the soil a r e balanced to find the change in storage over a p a r t i c u l a r t i m e . A knowledge of the amount of w a t e r s t o r e d in the soil is a l s o i m p o r t a n t for plot e x p e r i m e n t s , designed to r e l a t e plant growth to physical p a r a m e t e r s , and for l a r g e - s c a l e m a n a g e ment s c h e m e s , w h e r e the effects of land-iLSe change on w a t e r yield need to be a s s e s s e d .

10 EVAPOTRANSPIRATION A N D THE W A T E R BALANCE Site 13 was chosen b e c a u s e t h e r e was a need for some information of conditions at the e a s t e r n end of the catchment n e a r the coast line (Figure 10). The soil m o i s t u r e content e x p r e s s e d as a p e r centage dry weight is obtained by taking the mean of the r e p l i c a s a m p l e s at each level. T h e r e f o r e , for each site a run of data is available for four levels in the profile. The profile m e a n m o i s t u r e content is e x p r e s s e d as the mean of the m o i s t u r e content at the four levels within the profile.

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