$($a$).$ In an irrigated maize field, $300k\frac{g}{h}a$ of the compound fertilizer grade $20-20-10$ formulation of a water soluble fertilizer was applied using the fertigation method. What was the formulation of a water soluble fertilizer was agblied usmg the fervigation met

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$($b$)$ A dry flowable formulation of metribuzin $($Sensor $$0$ DF$)$ has been recomimended for a hectare of irrigated field of soybean at $0\mathrm{.}85kg$ ai$.$ ha$.$ If the sime of the field in $105$ hectares, what quantity of the product would be needed?