The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.

The data for land management practices are reported for the year preceding the census year.

1. Since 1996, the area of land that was treated with herbicides, insecticides and fungicides was under-reported. Some respondents reported chemical expenses but not any corresponding areas to which these chemicals were applied. Telephone follow-up with a sample of these respondents confirmed that some respondents had mistakenly reported for the current year instead of the previous year as requested and, when they completed their questionnaires for 1996 to 2006, the chemicals purchased had not yet been applied.
2. The data since 1996 pertain to the area of land on which only insecticides were used. The 1996 to 2006 questionnaires had two separate questions on the area of land on which insecticides were used and the area on which fungicides were used. In 1981, 1986 and 1991, however, a single question asked for the area on which insecticides and fungicides were applied to the same land. Therefore, the sum of responses to the 1996 to 2006 questions is not comparable to responses to the single question in previous censuses.