Factors that make Zakaat compulsory

Q: My ring was lost for a period of 2 years. I now found my ring. Do I need to pay zakaat for the years during which my ring was lost?

Q: Do I have to pay Zakaah on my car which is finish paid for?

Q: Zaid has one sister. She is 75 years old and is an Alzheimers patient. Her condition is such that sometimes she is unable to recognize her own daughter, always keeps on asking about her son (she actually never had any son), and is living in the past where she thinks her husband and mother are still alive (and in reality they died many years back). She doesn't remember that she has to offer salah.

While distributing their mother's inheritance money, Zaid kept his sister's 4 lakh in his bank account as amanat. There are 5 witnesses over it. He is not using this money as he fears Allah Ta'ala. The pension she gets is enough for her basic needs. Zaid wants to know if he needs to discharge his sister's zakat from her share i.e. 4 lakh rupees, or should it remain untouched as she is not in her senses?

Q: I have a debt and some assets. However, my debt is more than my assets. Does the zakat still apply to me.

Q: Do I have to pay Zakat on rental income or the value of the rental property? Just like paying Zakat on the value of gold and stock?

Q: I bought a land to build my home on but for more than one year I am unable to build on it. Should I pay zakat for it?

Q: A female becomes baligh and is already in possesion of wealth which makes her liable for Zakaat - does she have to wait one year - that is, must she be in possesion of the wealth as a 'major' (as opposed to being a minor) for one year before paying zakaat?

Q: If one has 100gms of gold but takes a loan from one of his relatives of 4 laks, not in gold but on credit, so does he have to pay zakaat?

Q: I always paid zakaat on monies people owed to me regarding this as an asset. My question after listening to this mornings audio (zakaat on waived debt), does this mean I do not have to pay zakaat on monies due to me from loans given to a friend, family until such time as the money is repaid to me.

Q: I have question regarding zakat. I have cultivated bamboo on my land. Do I have to give zakat on bamboo? As far I know, the bamboo plant is not for eating so after harvesting it will I have to pay zakat?

What about sugarcane cultivation? E.g if I cultivate sugarcane on my land, it takes one year to harvest and after harvesting I have to send it to the sugar mills and I receive my money like after 2-3 months. So it takes 14 months and my harvest is almost more than 40000 mound what I have to pay? Will it count in money?