Srimad Bhagavatam Canto 04, Chapter 18, Text 08

SB 4.18.8

nunam ta virudhah ksina
mayi kalena bhuyasa
tatra yogena drstena
bhavan adatum arhati
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Due to being stocked for a very long time, all the grain seeds within me have certainly deteriorated. Therefore you should immediately arrange to take these seeds out by the standard process, which is recommended by the acaryas or sastras.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
When there is a scarcity of grain, the government should follow the methods prescribed in the sastra and approved by the acaryas; thus there will be a sufficient production of grains, and food scarcity and famine can be checked. Bhagavad-gita recommends that we perform yajña, sacrifices. By the performance of yajña, sufficient clouds gather in the sky, and when there are sufficient clouds, there is also sufficient rainfall. In this way agricultural matters are taken care of. When there is sufficient grain production, the general populace eats the grains, and animals like cows, goats and other domestic animals eat the grasses and grains also. According to this arrangement, human beings should perform the sacrifices recommended in the sastras, and if they do so there will no longer be food scarcity. In Kali-yuga, the only sacrifice recommended is sankirtana-yajña.
In this verse there are two significant words: yogena, “by the approved method,” and drstena, “as exemplified by the former acaryas.” One is mistaken if he thinks that by applying modern machines such as tractors, grains can be produced. If one goes to a desert and uses a tractor, there is still no possibility of producing grains. We may adopt various means, but it is essential to know that the planet earth will stop producing grains if sacrifices are not performed. The earth has already explained that because nondevotees are enjoying the production of food, she has reserved food seeds for the performance of sacrifice. Now, of course, atheists will not believe in this spiritual method of producing grains, but whether they believe or not, the fact remains that we are not independent to produce grain by mechanical means. As far as the approved method is concerned, it is enjoined in the sastras that intelligent men in this age will take to the sankirtana movement, and by so doing they shall worship the Supreme Personality of Godhead Lord Caitanya, whose bodily complexion is golden and who is always accompanied by His confidential devotees to preach this Krsna consciousness movement all over the world. In its present condition, the world can only be saved by introducing this sankirtana, this Krsna consciousness movement. As we have learned from the previous verse, one who is not in Krsna consciousness is considered a thief. Even though he may be materially very advanced, a thief cannot be placed in a comfortable position. A thief is a thief, and he is punishable. Because people are without Krsna consciousness, they have become thieves, and consequently they are being punished by the laws of material nature. No one can check this, not even by introducing so many relief funds and humanitarian institutions. Unless the people of the world take to Krsna consciousness, there will be a scarcity of food and much suffering.
Srimad Bhagavatam Canto 04, Chapter 18, Text 07
Srimad Bhagavatam Canto 04, Chapter 18, Text 09-10