deriv SD cv (1249) ashtadhyayi.com hei.de L 1249 ETT STT a 5.2.1 ALPH OLDHOMEPAGE NEWHOMEPAGE

dhAnyAnAm bhavane kSetre khaJ

धान्यानां भवने क्षेत्रे खञ् ONPANINI 52001

Add /khaJ after grains to mean their granary or field.

This /khaJ is actually Ina ईन, by !! by AyaneyIn....

yasmin mudgAs tat kSetram यस्मिन्मुद्गास्तत्क्षेत्रम् "field in which there are beans"
→ mudgaH मुद्गः + /khaJ + /su by this rule
→ !**maudgInam मौद्गीनम् "beanfield"

Does bhavanam भवनम् mean "a granary"?

No, it just means "a building".