Solubility and Leaching Risks of Organic Carbon in Paddy Soils as Affected by Irrigation Managements

Table 1

Limits for irrigation in different stages of rice for non-flooding controlled irrigation.

Stages	Regreening	Tillering			Jointing and booting		Heading and flowering	Milk maturity	Yellow maturity
		Former	Middle	Later	Former	Later
Upper limit	30 mm	𝜃𝑠1	𝜃𝑠1	𝜃𝑠1	𝜃𝑠2	𝜃𝑠2	𝜃𝑠3	𝜃𝑠3	Drying
Lower limit	10 mm	0.7𝜃𝑠1	0.65𝜃𝑠1	0.6𝜃𝑠1	0.7𝜃𝑠2	0.75𝜃𝑠2	0.8𝜃𝑠3	0.7𝜃𝑠3
Monitored soil depth (cm)	—	0–20	0–20	0–20	0–30	0–30	0–40	0–40	—

𝜃𝑠₁, 𝜃𝑠₂, and 𝜃𝑠₃ are the saturated water content of the soil in different stages of rice.