In Poland, maize planting begins in May, while winter wheat harvesting starts in July. Over the reporting period, the cropped arable land fraction (CALF) remained the same as the average of the last five years. During April to July, rainfall (RAIN) was up 11% compared to average. Both temperature (TEMP) and radiation (RADPAR) were near average, while the potential biomass (BIOMSS) increased 5% due to the sufficient rainfall.

As shown in the NDVI crop condition development graph, the NDVI in Poland is below average but comparable to the previous 2014-15 season. In most parts of the country with the exception of the southwest, NDVI was lower than usual until May due to the poor weather conditions early in the season; afterwards, however, NDVI recovered as a result of sufficient rainfall. In the southwest, including Dolnoslaskie and Wielkopolskie, crop development is slightly advanced. Considering the average VCIx of 0.87, the final assessment for Poland is that crop condition is mixed but fair. 

         在波兰，玉米于5月开始种植，冬小麦在7月开始收割。本次监测期间，2016年4月至7月，波兰耕地种植比例接近于近过去5年平均水平。降水较往年平均水平偏高11%，温度和光合有效辐射接近于往年平均水平，受充沛降水影响，潜在累积生物量上升了5%。

         如NDVI作物生长过程线所示，在本次监测期间，波兰NDVI低于2014-2015年同期水平，在波兰除了西南部以外的大部分地区，受气候条件影响，5月前，NDVI低于往年平均水平，随后，充沛的降水导致其NDVI有所恢复。在西南地区，包括下西里西亚和大波兰省，作物物候有所提前。考虑到波兰整体最佳植被状况健康指数为0.87，我们对波兰作物长势评定为局部地区较好。

图 3.25  2016 年 4-7 月波兰作物长势

（a）基于 NDVI 的作物生长过程线                  （b）最佳植被状况指数

（c）NDVI 距平空间聚类图（与 5 年平均相比）         （d）NDVI 距平聚类过程线