I got a data regarding the Ed/Es.
In 2001, US sugar business
Domestic price :$0.215/pound.
International price : $0.083/pound.
Production : 17.4 billion pounds. (3.74 billions worth of productions domestically)
Consumption : 20.4 billion pounds. (0.4 billion went into tariff)
We got Es = 1.5, and Ed = -0.3
Qs = -8.7 + 1.214P
Qd = 26.53 - 0.285P
Quantity at the unit of billion pounds, and price at cents. (1/100 dollars)
The total subsidies to agriculture is about 20 billion dollars/year. The reality of who gets this government help is interesting. Actually, farm products that receive large subsidies account for just 36 percent of agricultural production. Two-thirds of all farm subsidies go to just 10 percent of farms, most of which earn over $250,000 annually. The larger farms usually hijack these subsidies.
Thus Ed/Es is 0.2, a quite small number. And if there is no protection against import in sugar, and the subsidy policy. The sugar industries within U.S border will shrink to a level of 1.4 billion pounds production level at $0.083/pound international prices. And if there is no import at all, but purely supported by limited domestic production, the domestic price will go up to $0.882/pound. So yes, although the model is greatly simplified, but tell us that this policy is effective in a way to protect the price not going too high (drop 3/4 of the price) if the industry can not sustain itself domestically. But in a way also increase the price domestically compared to international market. In order to protect the smaller sugar industries in U.S, it is hurting other industries, and customers. There are many papers discuss the negative effect of such policies.
P.S the policy of subsidy is also always accompany with the tariff policy or import quota limits. So the subsidize/protected agriculture industry will have their "protected price" domestically.