The non-certificated pilot reported that during initial climb the powered parachute (PPC) was difficult to control due to the wind conditions. The pilot reported that he reduced engine power at about 50 feet above ground level (agl) and the PPC “fell instead of floating” to the ground. The aircraft rolled over during touchdown causing the pilot to put his hand out to stop the roll which resulted in a broken arm. The pilot reported that there were no preaccident mechanical malfunctions or failures with the PPC that would have precluded normal operation. The FAA Powered Parachute Flying Handbook stated that a quick reduction in throttle during a high pitch angle climb could contribute to a stall. This action quickly turns a high pitch climb into a high angle of attack. Additionally, the handbook recommends maintaining power throughout an approach when flying in more turbulent air to reduce the descent rate in case of down gusts and the possibility of an excessive descent rate.