When one performs ritualistic sacrifices as prescribed in the Vedas, one needs expert brahmanas known as yajnika-brahmanas. In Kali-yuga, however, there is a scarcity of such brahmanas. Therefore in Kali-yuga the sacrifice recommended in sastra is sankirtana-yajna (yajnaih sankirtana-prayair yajanti hi sumedhasah [SB 11.5.32]). Instead of spending money unnecessarily on performing yajnas impossible to perform in this age of Kali because of the scarcity of yajnika-brahmanas, one who is intelligent performs sankirtana-yajna. Without properly performed yajnas to satisfy the Supreme Personality of Godhead, there will be scarcity of rain (yajnad bhavati parjanyah [Bg. 3.14]). Therefore the performance of yajna is essential. Without yajna there will be a scarcity of rain, and because of this scarcity, no food grains will be produced, and there will be famines. It is the duty of the king, therefore, to perform different types of yajnas, such as the asvamedha-yajna, to maintain the production of food grains. Annad bhavanti bhutani. Without food grains, both men and animals will starve. Therefore yajna is necessary for the state to perform because by yajna the people in general will be fed sumptuously. The brahmanas and yajnika priests should be sufficiently paid for their expert service. This payment is called daksina. Ambarisa Maharaja, as the head of the state, performed all these yajnas through great personalities like Vasistha, Gautama and Asita. Personally, however, he was engaged in devotional service, as mentioned before (sa vai manah krsna-padaravindayoh). The king or head of state must see that things go on well under proper guidance, and he must be an ideal devotee, as exemplified by Maharaja Ambarisa. It is the duty of the king to see that food grains are produced even in desert countries, what to speak of elsewhere.